chore: Update GH app installation copy in PR comment

[scott-codecov]

codecov/engineering-team#370

[codecov]

Codecov Report

Merging #86 (db74fee) into main (509baf4) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head db74fee differs from pull request most recent head f5f0707. Consider uploading reports for the commit f5f0707 to get more accurate results

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   98.47%   98.47%           
=======================================
  Files         361      361           
  Lines       26476    26476           
=======================================
  Hits        26072    26072           
  Misses        404      404           

Flag	Coverage Δ
integration	98.44% <100.00%> (ø)
latest-uploader-overall	98.44% <100.00%> (ø)
onlysomelabels	98.47% <100.00%> (ø)
unit	98.44% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
NonTestCode	97.13% <100.00%> (ø)
OutsideTasks	98.23% <100.00%> (ø)

Files Changed	Coverage Δ
...cation/notifiers/tests/integration/test_comment.py	92.17% <ø> (ø)
.../notification/notifiers/tests/unit/test_comment.py	100.00% <ø> (ø)
tasks/tests/integration/test_notify_task.py	100.00% <ø> (ø)
.../notification/notifiers/mixins/message/__init__.py	100.00% <100.00%> (ø)

Related Entrypoints
run/app.tasks.notify.Notify