feat(gitlab): add getPullRequest, getPullRequestFiles, getPullRequestFromBranch, createComment, getComment, updateComment and getUser

[jaysomani]

Summary

Implements the remaining pull request, comment, and user methods for the GitLab adapter, completing the full adapter implementation.

Changes

New methods implemented

• getPullRequest — fetches a merge request by iid, normalized to match Gitea/GitHub shape
• getPullRequestFiles — fetches changed files using /diffs endpoint with patch_id_sha polling to handle GitLab's async diff processing
• getPullRequestFromBranch — finds an open merge request by source branch
• createComment — creates a note on a merge request via GitLab notes API
• getComment — retrieves a note by ID, searching across all MRs in the repository
• updateComment — updates an existing note by ID
• getUser — fetches a user by username via GitLab users search API

Tests added

• Full test coverage for all new methods including invalid/edge case scenarios
• GitLab-specific tests: testGetEventPushMatchesCheckoutSha, testValidateWebhookEventUsesPlainToken, testCreateOrganization
• Parity tests matching Gitea: testGetUser, testGetUserWithInvalidUsername, testCreatePrivateRepository, testGetRepositoryWithNonExistingOwner, testCreateRepositoryWithInvalidName, testDeleteRepositoryTwiceFails, testDeleteNonExistingRepositoryFails, testGetPullRequestFromBranchNoPR, testCreateCommentInvalidPR, testGetCommentInvalidId

Notes

• GitLab notes (comments) are scoped to merge requests — getComment and updateComment search across all MRs to find the note by ID since the MR iid is not stored with the comment ID
• getPullRequestFiles uses patch_id_sha polling per GitLab's official documentation recommendation for async diff processing
• getUser returns username field (not login like Gitea/GitHub) — this is a GitLab API difference
• This PR is based on feat/gitlab-adapter-webhooks and will need a rebase once that PR merges

[greptile-apps]

Greptile Summary

This PR implements the remaining GitLab adapter methods (getPullRequest, getPullRequestFiles, getPullRequestFromBranch, createComment, getComment, updateComment, getUser) and activates the corresponding integration tests. It also introduces a paginated findMrIidForNote helper that correctly addresses the previously flagged MR-list truncation and spurious-PUT issues.

Confidence Score: 5/5

Safe to merge; no P0 or P1 issues found — only two P2 style/performance suggestions.

All findings are P2: a redundant API call in getComment and a missing early-exit guard in the getPullRequestFiles polling loop. Both leave behavior functionally correct, just slightly inefficient. Previously flagged P1s (pagination gaps, spurious PUTs) are resolved by the new findMrIidForNote helper.

No files require special attention.

Important Files Changed

Filename	Overview
src/VCS/Adapter/Git/GitLab.php	Implements getPullRequest, getPullRequestFiles, getPullRequestFromBranch, createComment, getComment, updateComment, getUser, and a helper findMrIidForNote with pagination; addresses previous pagination/N-PUT issues; minor redundant fetch in getComment and missing error-check in polling loop.
tests/VCS/Adapter/GitLabTest.php	Replaces all previously-skipped stubs with real integration tests; adds new parity and edge-case tests; uses assertEventually for async-sensitive assertions; overall solid test coverage for new methods.

_{Reviews (5): Last reviewed commit: "Merge branch 'utopia-php:main' into feat..." | Re-trigger Greptile}

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

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