feat(gitlab): add GitLab source integration with SSH and HTTP basic auth

Add full GitLab application source support for git operations:
- Implement SSH-based authentication using private keys with configurable ports
- Support HTTP basic auth for HTTPS GitLab URLs (with or without deploy keys)
- Handle private key setup and SSH command configuration in both Docker and local modes
- Support merge request checkouts for GitLab with SSH authentication

Improvements to credential handling:
- URL-encode GitHub access tokens to handle special characters properly
- Update log sanitization to redact passwords from HTTPS/HTTP URLs
- Extend convertGitUrl() type hints to support GitlabApp sources

Add test coverage and seed data:
- New GitlabSourceCommandsTest with tests for private key and public repo scenarios
- Test for HTTPS basic auth password sanitization in logs
- Seed data for GitLab deploy key and public example applications

tests/Unit/SanitizeLogsForExportTest.php

@@ -153,6 +153,22 @@ it('removes AWS secret access key', function () {
     expect($result)->toContain('aws_secret_access_key='.REDACTED);
 });
 
+it('removes HTTPS basic auth passwords from git URLs', function () {
+    $testCases = [
+        'https://oauth2:glpat-xxxxxxxxxxxx@gitlab.com/user/repo.git' => 'https://oauth2:'.REDACTED.'@'.REDACTED,
+        'https://user:my-secret-token@gitlab.example.com/group/repo.git' => 'https://user:'.REDACTED.'@'.REDACTED,
+        'http://deploy:token123@git.internal.com/repo.git' => 'http://deploy:'.REDACTED.'@'.REDACTED,
+    ];
+
+    foreach ($testCases as $input => $notExpected) {
+        $result = sanitizeLogsForExport($input);
+        // The password should be redacted
+        expect($result)->not->toContain('glpat-xxxxxxxxxxxx');
+        expect($result)->not->toContain('my-secret-token');
+        expect($result)->not->toContain('token123');
+    }
+});
+
 it('removes generic URL passwords', function () {
     $testCases = [
         'ftp://user:ftppass@ftp.example.com/path' => 'ftp://user:'.REDACTED.'@ftp.example.com/path',