test(e2e): run e2e tests with destination based mapping

[chetan-rns]

What does this PR do / why we need it:

Currently, the e2e tests cover scenarios for namespace-based mapping and have minimal coverage for destination-based mapping. This can lead to issues where a feature may not work properly in one of the mappings. We need to ensure the quality of the argocd-agent in both the mapping modes. In this PR, we update the existing e2e tests to run in both modes. Using environment variables, we can run the same e2e tests with different configurations in the GitHub actions.

Assisted-by: Cursor

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

Checklist

• Documentation update is required by this PR (and has been updated) OR no documentation update is required.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.07%. Comparing base (8cf8718) to head (5709591).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1028      +/-   ##
==========================================
+ Coverage   48.06%   48.07%   +0.01%     
==========================================
  Files         125      125              
  Lines       18789    18789              
==========================================
+ Hits         9030     9032       +2     
+ Misses       8943     8941       -2     
  Partials      816      816              

Flag	Coverage Δ
unit-tests	48.07% <ø> (+0.01%)	⬆️

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