Miscellaneous Pipeline Fixes

[laserprec]

Description

1. Fix broken codecov report with explicit flags separating code coverage for the 2 builds (pr-gate & nightly)
   • We (should) no longer see random increase/decrease in code coverage numbers.
2. Change codecov PR comment behavior to avoid email spam (sorry about that 😃)
3. Add markers to flaky tests and rerun them.
4. Add a notice for potential new release whenever there's a change to setup.py

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Related Issues

Checklist:

• I have followed the contribution guidelines and code style for this project.
• I have added tests covering my contributions.
• I have updated the documentation accordingly.
• This PR is being made to staging branch and not to main branch.

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Codecov Report

Merging #1545 (6f2a570) into staging (8d878aa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           staging    #1545   +/-   ##
========================================
  Coverage    62.07%   62.07%           
========================================
  Files           84       84           
  Lines         8492     8492           
========================================
  Hits          5271     5271           
  Misses        3221     3221           

Flag	Coverage Δ
pr-gate	62.07% <ø> (?)

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