Add examples for secure backend traffic guide

[salonichf5]

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: Users need examples for testing examples of secure backend traffic

Solution: Add yaml example files to test secure backend traffic

Testing: Tested that the examples work.

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 #879

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.

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.08%. Comparing base (3934c5c) to head (7c3e5f9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4341      +/-   ##
==========================================
- Coverage   86.09%   86.08%   -0.01%     
==========================================
  Files         132      132              
  Lines       14342    14342              
  Branches       35       35              
==========================================
- Hits        12348    12347       -1     
  Misses       1791     1791              
- Partials      203      204       +1     

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[bjee19]

We might need to revisit our examples files and see if these are needed since the official document doesn't link or reference any of these files. I think originally it was useful having these manifests since the official doc would apply straight from this repo, but since we have the yaml on the document these aren't used. But approving for now

[sjberman]

Can we change the directory name to secure-backend to be more specific?