🌱 add readinessProbe for konnectivity-agent deployment

[kranurag7]

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Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

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Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• [ ] squashed commits
• [ ] includes documentation
• [ ] adds unit tests