Create a separate CI workflow for branch-YY.MM & main branches

[dagardner-nv]

Description

• Prevents an issue where creating a release PR triggers two CI jobs:

  1. For the pull-request/NNN branch created by the PR
  2. For the push to branch-YY.MM

• Unfortunately the changes for branch-YY.MM and main can't be tested until after the changes are merged.

Closes #459

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[mdemoret-nv]

Lets make a spreadsheet of the CI steps and what should run in each scenario and revisit this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.06%. Comparing base (7b599a3) to head (c61ef52).
Report is 1 commits behind head on branch-24.06.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-24.06     #466      +/-   ##
================================================
- Coverage         74.08%   74.06%   -0.03%     
================================================
  Files               403      403              
  Lines             14401    14401              
  Branches           1132     1132              
================================================
- Hits              10669    10666       -3     
- Misses             3732     3735       +3     

Flag	Coverage Δ
cpp	70.82% <ø> (-0.03%)	⬇️
py	41.81% <ø> (ø)

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see 4 files with indirect coverage changes

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