chore: update local lint task to only lint changed files

[ctreatma]

Since we might periodically change linter configuration, as done in #849, we should keep the existing PR validation behavior that only lints the files that were changed in a particular PR. This will allow us to continue to avoid unnecessarily large PRs to fix linting failures if and when the linter configuration changes.

If we're keeping the current, limited PR validation behavior, we should use the same behavior for the make lint task to that developers can easily identify the minimum necessary changes locally. This updates the make lint task to only lint files that have been changed since origin/main, which should closely approximate the behavior of the PR validation workflow.

[thogarty]

LGTM. I tested locally as well. Thanks, @ctreatma !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.03%. Comparing base (432b381) to head (e3e4396).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #851   +/-   ##
=======================================
  Coverage   35.03%   35.03%           
=======================================
  Files         187      187           
  Lines       24846    24846           
=======================================
  Hits         8704     8704           
  Misses      15995    15995           
  Partials      147      147           

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