BZ-1608216 Set timeoutSeconds for readinessProbe on Cassandra RCs

[rubenvp8510]

BZ LInk: https://bugzilla.redhat.com/show_bug.cgi?id=1608216

This also should be backported to 3.10

[papr-bot]

Can one of the admins verify this patch?
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[vrutkovs]

/ok-to-test

[vrutkovs]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rubenvp8510, vrutkovs

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[vrutkovs]

/cherrypick release-3.10

[openshift-cherrypick-robot]

@vrutkovs: once the present PR merges, I will cherry-pick it on top of release-3.10 in a new PR and assign it to you.

In response to this:

/cherrypick release-3.10

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[openshift-cherrypick-robot]

@vrutkovs: new pull request created: #9421

In response to this:

/cherrypick release-3.10

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