test: reuse Gitlab repos

[Camila-B]

• Creates new repos based on the test cluster name and RSync namespace and name, similar to what is done by other gitproviders
• Removes the deletion of Gitlab repos since they can now be reused
• Replaces the use of curl with the http package

[gemini-code-assist]

Summary of Changes

Hello @Camila-B, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refactors the Gitlab integration within the e2e testing framework. The primary goal is to optimize test execution by enabling the reuse of Gitlab repositories, thereby reducing setup and teardown overhead. Additionally, it modernizes the underlying API communication by replacing external curl commands with Go's standard HTTP client.

Highlights

• Gitlab Repository Reuse: Gitlab repositories used in tests are now created based on the test cluster name and RSync namespace and name, allowing them to be reused across test runs, similar to other git providers.
• Removal of Gitlab Repository Deletion: The logic for deleting Gitlab repositories after tests has been removed, as the new naming convention facilitates reuse rather than recreation.
• Migration from curl to net/http package: All Gitlab API calls previously made using curl command execution have been refactored to use Go's native net/http package for improved reliability and integration.

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[gemini-code-assist]

Code Review

This pull request refactors the GitLab e2e test provider to reuse repositories and replace curl commands with the native http package. The changes are well-structured, but I've found a few issues. There's a critical resource leak due to a missing resp.Body.Close(), an incorrect HTTP status code check when creating a repository, and a misleading error message. Additionally, the new utility function for sanitizing GitLab repository names is missing unit tests. I've provided suggestions for these points.

[tiffanny29631]

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tiffanny29631

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