Make EPP flags configurable

[salonichf5]

Proposed changes

Cherry-pick PR for 4105

Testing: Describe any testing that you did.

Please focus on (optional): If you any specific areas where you would like reviewers to focus their attention or provide
specific feedback, add them here.

Closes #ISSUE

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

Add support to make endpoint picker communication settings configurable.

[codecov]

Codecov Report

❌ Patch coverage is 72.50000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.12%. Comparing base (6d58c4b) to head (f034ceb).
⚠️ Report is 1 commits behind head on release-2.2.

Files with missing lines	Patch %	Lines
cmd/gateway/commands.go	77.77%	6 Missing ⚠️
cmd/gateway/endpoint_picker.go	0.00%	3 Missing ⚠️
internal/controller/manager.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.2    #4189      +/-   ##
===============================================
+ Coverage        86.07%   86.12%   +0.05%     
===============================================
  Files              131      131              
  Lines            14200    14230      +30     
  Branches            74       74              
===============================================
+ Hits             12223    12256      +33     
+ Misses            1776     1773       -3     
  Partials           201      201              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.