Fix index out of bounds error when building status

[sjberman]

Problem: There's a specific scenario where we can hit an out of bounds index while building route statuses. I don't know the exact scenario, but it involves a parentRef without a sectionName, on a Gateway with a single listener. Could possibly involve having multiple implementations being deployed as well.

Solution: Adjust the logic to ensure we don't access indices that are out of bounds.

Testing: Verified that this error does not occur in the previous scenario.

Closes #3512

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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Fix index out of bounds error when building status

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.78%. Comparing base (cb719a6) to head (92e75b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3513      +/-   ##
==========================================
- Coverage   86.79%   86.78%   -0.02%     
==========================================
  Files         127      127              
  Lines       15079    15079              
  Branches       62       62              
==========================================
- Hits        13088    13086       -2     
- Misses       1840     1841       +1     
- Partials      151      152       +1     

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