fix: annotation konghq.com/rewrite always works

[programmer04]

What this PR does / why we need it:

Fixes bug reported by user description of the problem and steps to reproduce it robustly are here #6542 (comment)

Which issue this PR fixes:

Fixes #6542

Special notes for your reviewer:

This feature was covered with a quite complicated integration test TestIngressRewriteURI designed to catch exactly such a bug, but it failed to do so. Why?

• 8e5f883
  Changes in the test have no effect (it's just an opportunistic cleanup not to have redundant stuff). The bug was hard to catch due to the order of items in the Go map during iteration - it's random and it even may be randomized for each iteration. Hence this commit always enforces the same order for defined routes by sorting them (IMHO KIC should always operate in a consistent and reproducible manner so paying the cost of sorting is worth it). This change leads to the consistent failure of the test TestIngressRewriteURI as it is supposed to be.

• 6898b9c
  Actual one-line fix return -> continue to not ignore a rewrite annotation that is not attached to the first item in a list. It resolves the problem (as I said even without changes from the first commit).

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.6%. Comparing base (030db71) to head (22c892d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #6626     +/-   ##
=======================================
+ Coverage   72.2%   77.6%   +5.4%     
=======================================
  Files        202     201      -1     
  Lines      25817   23841   -1976     
=======================================
- Hits       18643   18508    -135     
+ Misses      6159    4378   -1781     
+ Partials    1015     955     -60     

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