ci: fix PR triage permissions and triggers

[Kyle-Ye]

Summary

• Grant the issue permission required by the shared PR triage workflow so it can start and apply labels.
• Run triage when a pull request is reopened or updated.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.17%. Comparing base (7b30d53) to head (ddbd563).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #240   +/-   ##
=======================================
  Coverage   32.17%   32.17%           
=======================================
  Files          71       71           
  Lines        2601     2601           
=======================================
  Hits          837      837           
  Misses       1764     1764           

Flag	Coverage Δ
ios	32.19% <ø> (ø)
macos	10.15% <ø> (ø)
ubuntu	12.03% <ø> (ø)

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[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenAttributeGraph-Package	✅	0 %	90	0	90	7327655f6

Builds 🔨

Scheme	Status	Duration	Commit
OpenAttributeGraph	✅	9.1s	7327655f6
OpenAttributeGraph-Package	✅	28.2s	7327655f6