DFBUGS-4713: [release-4.20] Change the resource requirement base calculation from 6 to 3 OSDs

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2385

/assign malayparida2000

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[malayparida2000]

/retitle DFBUGS-4713: [release-4.20] Change the resource requirement base calculation from 6 to 3 OSDs

[openshift-ci-robot]

@openshift-cherrypick-robot: This pull request references [Jira Issue DFBUGS-4713](https://issues.redhat.com//browse/DFBUGS-4713), which is invalid:

• expected the bug to target the "odf-4.20" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

In response to this:

This is an automated cherry-pick of #2385

/assign malayparida2000

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[SanjalKatiyar]

@malayparida2000 we need a PR for release-4.y-compatibility branch as well.