(#3817) Append download tab completion options

Add comprehensive completion entries for the `choco download` command
to TabExpansion and update tests to assert those completions when the
licensed/pro features are available.

- Extend commandOptions.download with many download-related flags:
  allow-empty-checksums, allow-empty-checksums-secure,
  ignore-checksum, ignore-dependencies-from-source, require-checksums, 
  and other existing download switches. This ensures the tab completion
  engine exposes all pro and non-pro download options.
- Add a Pester test case (Should list completions for downolad (Licensed))
  that verifies the completion list includes the newly added download
  switches. The test is skipped when the license flag ($isLicensed) is
  not set, preserving existing test behavior.

This change fixes missing completions for `choco download`, improving the
shell UX for licensed users and keeping tests aligned with available
pro flags.

Author: AdmiringWorm

src/chocolatey.resources/helpers/ChocolateyTabExpansion.ps1

@@ -74,7 +74,7 @@ if (Test-Path $licenseFile) {
         'optimize'
     )
 
-    $commandOptions.download = "--append-use-original-location --cert='' --certpassword='' --disable-repository-optimizations --download-location='' --ignore-dependencies --ignore-unfound --installed-packages --internalize --internalize-all-urls --output-directory='' --password='' --prerelease --resources-location='' --skip-download-cache --skip-virus-check --source='' --use-download-cache --user='' --version='' --virus-check --virus-positives-minimum=''"
+    $commandOptions.download = "--allow-empty-checksums --allow-empty-checksums-secure --append-use-original-location --cert='' --certpassword='' --disable-repository-optimizations --download-location='' --ignore-checksum --ignore-dependencies --ignore-dependencies-from-source='' --ignore-unfound --installed-packages --internalize --internalize-all-urls --output-directory='' --password='' --prerelease --require-checksums --resources-location='' --skip-download-cache --skip-virus-check --source='' --use-download-cache --user='' --version='' --virus-check --virus-positives-minimum=''"
     $commandOptions.optimize = "--id='' --reduce-nupkg-only"
 
     # Add pro switches to commands that have additional switches on Pro

tests/pester-tests/chocolateyProfile.Tests.ps1

@@ -100,6 +100,41 @@ Describe "Chocolatey Profile" -Tag Chocolatey, Profile, Environment {
             $Completions | Should -Contain "--value=''" -Because $becauseCompletions
         }
 
+        It "Should list completions for download (Licensed)" -Skip:(!$isLicensed) {
+            $Command = "choco download "
+            $Completions = (TabExpansion2 -inputScript $Command -cursorColumn $Command.Length).CompletionMatches.CompletionText
+
+            $becauseCompletions = ($Completions -Join ", ")
+
+            $Completions | Should -Contain "--allow-empty-checksums" -Because $becauseCompletions
+            $Completions | Should -Contain "--allow-empty-checksums-secure" -Because $becauseCompletions
+            $Completions | Should -Contain "--append-use-original-location" -Because $becauseCompletions
+            $Completions | Should -Contain "--cert=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--certpassword=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--disable-repository-optimizations" -Because $becauseCompletions
+            $Completions | Should -Contain "--download-location=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--ignore-checksum" -Because $becauseCompletions
+            $Completions | Should -Contain "--ignore-dependencies" -Because $becauseCompletions
+            $Completions | Should -Contain "--ignore-dependencies-from-source=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--ignore-unfound" -Because $becauseCompletions
+            $Completions | Should -Contain "--installed-packages" -Because $becauseCompletions
+            $Completions | Should -Contain "--internalize" -Because $becauseCompletions
+            $Completions | Should -Contain "--internalize-all-urls" -Because $becauseCompletions
+            $Completions | Should -Contain "--output-directory=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--password=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--prerelease" -Because $becauseCompletions
+            $Completions | Should -Contain "--require-checksums" -Because $becauseCompletions
+            $Completions | Should -Contain "--resources-location=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--skip-download-cache" -Because $becauseCompletions
+            $Completions | Should -Contain "--skip-virus-check" -Because $becauseCompletions
+            $Completions | Should -Contain "--source=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--use-download-cache" -Because $becauseCompletions
+            $Completions | Should -Contain "--user=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--version=''" -Because $becauseCompletions
+            $Completions | Should -Contain "--virus-check" -Because $becauseCompletions
+            $Completions | Should -Contain "--virus-positives-minimum=''" -Because $becauseCompletions
+        }
+
         It "Should list completions for export" -Skip:$ExportNotPresent {
             $Command = "choco export "
             $Completions = (TabExpansion2 -inputScript $Command -cursorColumn $Command.Length).CompletionMatches.CompletionText