test: update SanitizeRepoName

[Camila-B]

• Replaces repoPrefix with repoSuffix which now includes the GCP project name. This will help prevent collisions that can occur given that the ci-main and ci-release projects have the same set of cluster names
• Prevents double dashes from occuring in the santizied repo name

[google-oss-prow]

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[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 refactors the repository naming convention within the e2e test suite to prevent naming collisions. It introduces a repoSuffix that incorporates the GCP project name, replacing the previous repoPrefix. This change ensures that generated repository names are more unique, especially in shared testing environments where cluster names might overlap, thereby improving the reliability of e2e tests.

Highlights

• Renamed Naming Convention Variable: The repoPrefix variable has been consistently renamed to repoSuffix across CSRClient and SSMClient structs, their constructors, and the SanitizeRepoName utility function.
• Enhanced Repository Naming Logic: The SanitizeRepoName function now constructs the full repository name by appending the repoSuffix to the base name (name + "-" + repoSuffix) and includes a step to trim trailing dashes before adding the hash, improving readability and consistency.
• Incorporated GCP Project Name for Uniqueness: The repoSuffix now explicitly includes the GCP project name (*e2e.GCPProject + "/" + clusterName) when initializing CSRClient and SSMClient instances, directly addressing the issue of potential naming collisions across different GCP projects sharing similar cluster names.
• Updated Test Cases: The reponame_test.go file has been updated to reflect the new repoSuffix logic and includes additional test cases to validate the truncation behavior and collision prevention with the new naming scheme.

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[gemini-code-assist]

Code Review

This pull request updates the repository name sanitization logic to prevent collisions by including the GCP project name. The change from repoPrefix to repoSuffix and the updated SanitizeRepoName function effectively address the problem described. I have a couple of suggestions to improve the implementation: one to reduce code duplication and another to make the string sanitization more robust.

[sdowell]

The CSR/SSM shouldn't need the GCP project in the repo name, they are already per-project resources. It's the git providers outside of GCP that would need the project in the name (gitlab, bitbucket, etc)

[Camila-B]

Good point. In that case, I'll make the necessary changes to the repo name in #1912 instead