fix: improve install error when pre-release driver already installed

[zeroshade]

Summary

Fixes #340.

• When a user runs dbc install <driver> without --pre for a driver that only has pre-release versions and is already installed, the error now says the driver is already installed (with its version) instead of saying it was "not found"
• The original "not found (but prerelease versions filtered out)" error is preserved when the driver is not already installed
• Adds a test that installs a pre-release driver, then verifies the improved error when re-installing without --pre

Before:

Error: driver `singlestore` not found (but prerelease versions filtered out); try: dbc install --pre singlestore

After:

Error: driver `singlestore` is already installed (version 0.1.0-beta.1); only pre-release versions are available for this driver; to update, use: dbc install --pre singlestore

[amoeba]

Looks good to me, thanks!

[amoeba]

@ianmcook tagged you for review in case you want to. The most likely path the user will follow here would be,

~/src/columnar-tech/dbc fix/340-install-prerelease-error
$ go run ./cmd/dbc install singlestore
Error: driver `singlestore` not found (but prerelease versions filtered out); try: dbc install --pre singlestore
exit status 1

~/src/columnar-tech/dbc fix/340-install-prerelease-error
$ go run ./cmd/dbc install --pre singlestore
[✓] searching
[✓] downloading
[✓] installing
[✓] verifying signature

Installed singlestore 0.1.0-beta.1 to /Users/bryce/Library/Application Support/ADBC/Drivers


~/src/columnar-tech/dbc fix/340-install-prerelease-error
$ go run ./cmd/dbc install singlestore
Error: driver `singlestore` is already installed (version 0.1.0-beta.1); only pre-release versions are available for this driver; to update, use: dbc install --pre singlestore
exit status 1

~/src/columnar-tech/dbc fix/340-install-prerelease-error
$ go run ./cmd/dbc install --pre singlestore

Driver singlestore 0.1.0-beta.1 already installed at /Users/bryce/Library/Application Support/ADBC/Drivers

[amoeba]

Rebased to pick up the recent pre-commit config and pushed automatic fixes up.

[amoeba]

The pre-commit config is running under pull_request_target so I'll fix that in a follow-up. It's clean when I run locally so this PR is merge-able.