Encode GitLab credentials in clone URLs

[dfgvaetyj3456356-hash]

Summary

• URL-encode GitLab credential components before embedding them in HTTPS clone URLs
• route GitLabRepository clone URL formatting through GitLabCredentials.format_git_credentials() so the repository block gets the same credential handling as the credential helper
• add regression coverage for personal access tokens, deploy tokens, already-prefixed tokens, and repository clone command construction

Validation

python -m py_compile src\integrations\prefect-gitlab\prefect_gitlab\credentials.py src\integrations\prefect-gitlab\prefect_gitlab\repositories.py src\integrations\prefect-gitlab\tests\test_credentials.py src\integrations\prefect-gitlab\tests\test_repositories.py
git diff --check -- src/integrations/prefect-gitlab/prefect_gitlab/credentials.py src/integrations/prefect-gitlab/prefect_gitlab/repositories.py src/integrations/prefect-gitlab/tests/test_credentials.py src/integrations/prefect-gitlab/tests/test_repositories.py
PREFECT_TEST_MODE=1 python -m pytest src\integrations\prefect-gitlab\tests\test_credentials.py src\integrations\prefect-gitlab\tests\test_repositories.py -q

Result: 20 passed.

[github-actions]

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