ci: disable automatic workflow triggers, add workflow_dispatch

[devin-ai-integration]

Summary

Disable automatic push triggers in linters.yml and tests.yml. Job definitions are preserved — workflows can be triggered manually via workflow_dispatch.

Review & Testing Checklist for Human

• Verify both workflows now only trigger on workflow_dispatch
• Confirm linter and test job definitions are unchanged

Notes

This is part of an org-wide effort to reduce GitHub Actions spend by disabling automatic triggers across all repos.

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/7b4b537d6a95428d85ae1cf444f374ce
Requested by: @bsmitches

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[devin-ai-integration]

🤖 Devin AI Engineer

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.