Change check for remove regacy readiness gate

[cw-sakamoto]

#1782

If targetHealthCondTypes is empty, target pod is out of the control of v2, so recagy rediness gate is not should not be removed.

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[codecov-io]

Codecov Report

Merging #1843 (0d400fc) into main (3aa353d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## main #1843 +/- ## ======================================= Coverage 47.45% 47.46% ======================================= Files 110 110 Lines 6075 6076 +1 ======================================= + Hits 2883 2884 +1  Misses 2927 2927 Partials 265 265 

Impacted Files	Coverage Δ
pkg/inject/pod_readiness_gate.go	86.36% <100.00%> (+0.31%)	⬆️

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