[chore] Add local folder to .gitignore

[evan-bradley]

Description

Contrib has this folder, and I find it helpful for stashing working files (e.g. config files) for testing running the Collector from a binary.

Happy to take another approach if someone is doing something else to store files used to test the Collector locally.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.60%. Comparing base (71aae79) to head (fab1ec5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12089   +/-   ##
=======================================
  Coverage   91.60%   91.60%           
=======================================
  Files         456      456           
  Lines       24086    24086           
=======================================
  Hits        22064    22064           
  Misses       1649     1649           
  Partials      373      373           

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