Add proxy support to OpAMP bridge

[owais]

Fixes #5351

Description:
Add networking proxy support to OpAMP bridge

Link to tracking Issue(s):

• Resolves: Add proxy support to OpAMP bridge #5351

Testing:
Tested locally in a kind cluster

Documentation:
Added documentation describing the new config options.

[codecov]

Codecov Report

❌ Patch coverage is 78.04878% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.12%. Comparing base (52446da) to head (7652869).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...md/operator-opamp-bridge/internal/config/config.go	75.00%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5352      +/-   ##
==========================================
+ Coverage   63.07%   63.12%   +0.05%     
==========================================
  Files         215      215              
  Lines       15304    15345      +41     
==========================================
+ Hits         9653     9687      +34     
- Misses       4971     4975       +4     
- Partials      680      683       +3     

Flag	Coverage Δ
integration	68.10% <ø> (ø)
unittests	63.12% <78.04%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.