fix: fixing some misleading unit test case names

[keithfz]

What type of PR is this?

Fix

What this PR does / why we need it:
Some of the test cases in api/v1alpha1/validation/envoyproxy_validate_test.go were misleading.

I initially noticed a couple test cases were named "invalid" but they were actually valid scenarios, and were being checked as such with the expected: true field in the test table. This was for e.g. should be invalid when service patch type is empty

Upon this, also realized there two tests were not testing what they were supposed to be. E.g. should be invalid when pdb type not set should be valid, and was only invalid because the test did have the patch type set and did not the patch object, causing the invalid result. The correct thing to test for would be a valid case where type is not set, but patch is.

Also added more specific test names for the deployment cases, since we test patches for all deployment,daemonset,service,hpa,pdb in the validation tests, as well as fixed a misleading comment/log message in kubernetes_helpers.go that was related to similar codepaths.

Which issue(s) this PR fixes:

Fixes #4933

Release Notes: No

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.28%. Comparing base (469de2f) to head (47d1087).

Files with missing lines	Patch %	Lines
api/v1alpha1/kubernetes_helpers.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4934      +/-   ##
==========================================
+ Coverage   66.27%   66.28%   +0.01%     
==========================================
  Files         209      209              
  Lines       32035    32035              
==========================================
+ Hits        21231    21235       +4     
+ Misses       9541     9539       -2     
+ Partials     1263     1261       -2     

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[zhaohuabing]

LGTM thanks!

[shawnh2]

LGTM! Thanks for checking