chore: Fix syntax checking to include run-task file

[hneiva]

No description provided.

[hneiva]

Here is another example of the GH integration behaving different from local commit hooks.
When I committed my changes it didn't complain about fetch-content file 😵‍💫

[ahal]

Maybe we should just exclude all of external_tools as presumably we wouldn't want to lint anything in there.

[codecov]

Codecov Report

❌ Patch coverage is 6.25000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.65%. Comparing base (dc1b8ea) to head (9d1f159).
⚠️ Report is 545 commits behind head on main.

Files with missing lines	Patch %	Lines
src/taskgraph/run-task/fetch-content	0.00%	13 Missing ⚠️
src/taskgraph/run-task/run-task	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #279   +/-   ##
=======================================
  Coverage   58.65%   58.65%           
=======================================
  Files          69       69           
  Lines        6301     6301           
  Branches     1269     1269           
=======================================
  Hits         3696     3696           
  Misses       2328     2328           
  Partials      277      277           

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[ahal]

I recently fixed this elsewhere