Fix port binding with reduced privileges

[sjberman]

Problem: The nginx deployment was using extra privileges in order to bind to privileged ports (<1024). This included allowPrivilegeEscalation and NET_BIND_SERVICE. Sometimes this could cause issues in some secure environments.

Solution: Remove these extra privileges and take advantage of sysctls to lower the allowed port range for the pod its defined on.

Testing: Verified that everything still works, including in OpenShift.

Closes #3567

Checklist

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• 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

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please add a brief note that summarizes the change.

Fix port binding with reduced privileges. 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.86%. Comparing base (a523d21) to head (d461ded).
Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #3574 +/- ## ========================================== - Coverage 86.89% 86.86% -0.04%  ========================================== Files 127 127 Lines 15220 15226 +6 Branches 62 62 ========================================== Hits 13226 13226 - Misses 1843 1848 +5  - Partials 151 152 +1 

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