ingester/distributor: Ensure PDB is set to maxUnavailable of 1

[saswatamcode]

What this PR does / why we need it:

Which issue(s) this PR fixes:
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• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: saswatamcode
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[openshift-ci]

@saswatamcode: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/test	96bd9c3	link	true	/test test

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[xperimental]

/hold want to test the results first