chore: link PRs to linear issues

[nedsalk]

• Closes Automatic Linear x Github PR integration #3157

Summary

• Huge shoutout to @maschad who kindly solved my browser testing problems!

This PR adds a workflow which automatically links PRs to the corresponding linear issues by updating the body of the PR with markdown comments that contain linear-related magic words. The implementation supports all the GitHub magic words (closes, fixes, etc.). If one wants to relate a PR to an issue without setting it as closing for that issue, they can add a "relates to", "related to", or "part of" like this:

• Relates to #ISSUE1
• Related to #ISSUE2
• Part of #ISSUE3

Besides linking issues, I also implemented unlinking issues for cases where somebody erroneously links the wrong issue in GitHub (e.g. wanted to close #ISSUE2 but wrote that it closes #ISSUE1). This isn't automatically handled by linear when the referenced linear issue's identifier is removed from the body of the PR, so I had to call the linearClient.deleteAttachment endpoint directly in these cases.

I initially wanted to implement both linking and unlinking not by modifying the body of the PR but rather by using the API provided by the linear client, but then I realized that doing it like that doesn't add the metadata that gets added when using linear magic words.

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

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[codspeed-hq]

CodSpeed Performance Report

Merging #3191 will improve performances by ×2.7

_{Comparing ns/chore/linear-integration (315c2f8) with master (11d5fd6)}

Summary

⚡ 2 improvements
✅ 19 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	ns/chore/linear-integration	Change
⚡	Instantiate a new Unlocked wallet	103.1 ms	38.4 ms	×2.7
⚡	Instantiate from an address	31.5 ms	28.5 ms	+10.36%

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
77.17%(+0%)	71.81%(+0%)	75.77%(+0%)	77.28%(+0%)

Changed Files:

Coverage values did not change👌.

[nedsalk]

Superseded by FuelLabs/github-actions#40.