Improve Kong diagnostic config dumps

[rainest]

Update the Kong addon's diagnostics to:

• Extract DB-less config YAML from the mangled admin API JSON response.
• Add support for DB-backed config using decK parts.

Added 0.17 changelog since I'd like to try and figure out what the heck is going on with the frequent nightly Kong test failures and the tests that flake on their own, and I assume we want the CNI stuff available for the operator.

ktf-diag-2409850005.tar.gz is example Postgres (Enterprise) output.
ktf-diag-2834659457.tar.gz shows the updated DB-less output.

[codecov-commenter]

Codecov Report

Merging #334 (2057998) into main (fd088f5) will decrease coverage by 1.04%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             main    #334      +/-   ##
=========================================
- Coverage   10.28%   9.24%   -1.05%     
=========================================
  Files           5       5              
  Lines         690     768      +78     
=========================================
  Hits           71      71              
- Misses        614     692      +78     
  Partials        5       5              

Impacted Files	Coverage Δ
pkg/clusters/addons/kong/addon.go	0.00% <0.00%> (ø)

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[shaneutt]

It occurs to me that we're missing tests for this stuff entirely. Can we add some basic tests so that we can help prevent regressions where we might break the dumps in the future?

[rainest]

2057998 piggybacks on this since it's hopefully small enough and avoids waiting for the changelog update in a separate PR. While converting some of the problem KIC tests to use this system, I realized that we couldn't get the correct defer ordering for examples tests, since those need to delete YAML instead of resources, and the cleaner lacked support for that.