test(e2e): Re-enable instance workflow tests for real AWS testing

Remove LocalStack references from 3 instance workflow tests that were previously skipped:
- should launch instance with basic configuration
- should validate instance name is required
- should validate template is selected

These tests work correctly with real AWS (chromium project) and were only
failing in the LocalStack environment due to React frontend navigation issues.

Based on research findings, LocalStack is an AWS backend service emulator
and cannot help with browser-based E2E tests of React navigation. Moving
forward with real AWS testing using the 'aws' profile.

References:
- /tmp/LOCALSTACK_WEEK1_FINAL_STATUS.md
- /tmp/LOCALSTACK_RESEARCH_FINDINGS.md

Author: scttfrdmn

cmd/prism-gui/frontend/tests/e2e/instance-workflows.spec.ts

@@ -31,11 +31,7 @@ test.describe('Instance Management Workflows', () => {
   });
 
   test.describe('Instance Launch Workflows', () => {
-    // SKIP: LocalStack environment-specific navigation issue
-    // See: /tmp/LOCALSTACK_INVESTIGATION_UPDATE.md for details
-    // The app uses state-based navigation which doesn't work reliably in LocalStack
-    // Same tests pass in regular chromium project
-    test.skip('should launch instance with basic configuration @localstack', async () => {
+    test('should launch instance with basic configuration', async () => {
       // Step 1: Navigate to Instances tab
       await instancesPage.navigate();
 
@@ -85,8 +81,7 @@ test.describe('Instance Management Workflows', () => {
       expect(successMessage).toBe(true);
     });
 
-    // SKIP: LocalStack environment-specific navigation issue (see above)
-    test.skip('should validate instance name is required @localstack', async () => {
+    test('should validate instance name is required', async () => {
       await instancesPage.navigate();
       await instancesPage.openLaunchDialog();
       await launchDialog.waitForDialog();
@@ -100,8 +95,7 @@ test.describe('Instance Management Workflows', () => {
       expect(validationError).toMatch(/name.*required/i);
     });
 
-    // SKIP: LocalStack environment-specific navigation issue (see above)
-    test.skip('should validate template is selected @localstack', async () => {
+    test('should validate template is selected', async () => {
       await instancesPage.navigate();
       await instancesPage.openLaunchDialog();
       await launchDialog.waitForDialog();