fix: leave the probe path empty for TCP probes

[nilo19]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Not proactively set the default probe path for non HTTP or HTTPS probes.

Which issue(s) this PR fixes:

Fixes kubernetes/kubernetes#102803

Special notes for your reviewer:

Release note:

fix: leave the probe path empty for TCP probes

[coveralls]

Coverage increased (+0.001%) to 79.556% when pulling d37fa6c on nilo19:bug/tcp-probe into 13f66db on kubernetes-sigs:master.

[feiskyer]

/lgtm

Thanks for the fix. Let's also cherry-pick this to stable releases.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feiskyer, nilo19

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