ci: fix the linter by targeting the pr instead of the pr target

[pataar]

Description

The linter was targeting the target branch of a pull request, instead of the pull request itself. This way, lint errors would only occur after merging.

Screenshots:

You can see the difference here.

How Has This Been Tested?

By fixing the linting issues in this PR as well.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)

[pataar]

Obviously, the linter on pull_request_target fails. Because the target isn't linted correctly.

[codecov]

Codecov Report

Merging #861 (e76db59) into trunk (3d9f97c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            trunk     #861   +/-   ##
=======================================
  Coverage   59.31%   59.31%           
=======================================
  Files          93       93           
  Lines        7383     7383           
=======================================
  Hits         4379     4379           
  Misses       2619     2619           
  Partials      385      385           

Impacted Files	Coverage Δ
commands/mr/create/mr_create.go	33.24% <ø> (ø)
internal/config/writefile.go	100.00% <ø> (ø)
pkg/execext/lp.go	100.00% <ø> (ø)

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