Change check for remove regacy readiness gate

[cw-sakamoto]

Signed-off-by: cw-sakamoto sakamoto@chatwork.com

Fixes #1782

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

-s was missing with commit, so I recreated it.
#1843

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[kishorj]

/ok-to-test

[kishorj]

/lgtm

[kishorj]

/approve

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