Fix: suppress error comment on unsupported repos for E2E label

[yasserfaraazkhan]

Fixes posting comment on other repos other than mobile and desktop.

example : mattermost/mattermost#35541 (comment)

NONE

Summary by CodeRabbit

• Bug Fixes
  • Removed a redundant error comment when the system couldn't determine the end-to-end instance, reducing unnecessary notifications.
  • Stopped posting a “E2E started” comment after triggering workflows to cut down on repetitive status messages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cc581127-d668-4298-a758-dc09e232d2ef

📥 Commits

Reviewing files that changed from the base of the PR and between b8f2dbb and 5bb5f55.

📒 Files selected for processing (1)

• server/e2e_tests.go

💤 Files with no reviewable changes (1)

• server/e2e_tests.go

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📝 Walkthrough

Walkthrough

The pull request removes user-facing E2E comment postings: it no longer posts an error comment when the E2E instance type cannot be determined from the repository name, and it no longer posts an "E2E started" comment after successfully triggering the workflow.

Changes

Cohort / File(s)	Summary
E2E Comment Posting server/e2e_tests.go	Removed posting of an error comment when instance type cannot be determined; removed posting of an "E2E started" comment after triggering the workflow; function now returns early in the error case.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title clearly describes the main change: suppressing error comments when E2E/Run label is added to unsupported repositories.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-comment

📝 Coding Plan

• Generate coding plan for human review comments

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[saturninoabril]

Thanks @yasserfaraazkhan!