Fail validation if arbiter and flexibleScaling both are enabled

[raghavendra-talur]

No description provided.

[raghavendra-talur]

@jarrpa @umangachapagain This fixes the bug https://bugzilla.redhat.com/show_bug.cgi?id=1913357.

cc: @iamniting

[openshift-ci]

@raghavendra-talur: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/red-hat-storage-ocs-ci-e2e-aws	0b400e4	link	/test red-hat-storage-ocs-ci-e2e-aws

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[jarrpa]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jarrpa

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[jarrpa]

@vbnrh This would be another create use case to add to the admission controller.

[iamniting]

@raghavendra-talur I think we should cheery-pick this to the 4.7 branch

[agarwal-mudit]

/cherry-pick release-4.7

[openshift-cherrypick-robot]

@agarwal-mudit: #1010 failed to apply on top of branch "release-4.7":

Applying: StorageCluster: validate the spec before reconciling
Using index info to reconstruct a base tree...
M	controllers/storagecluster/reconcile.go
Falling back to patching base and 3-way merge...
Auto-merging controllers/storagecluster/reconcile.go
CONFLICT (content): Merge conflict in controllers/storagecluster/reconcile.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 StorageCluster: validate the spec before reconciling
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-4.7

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[agarwal-mudit]

@raghavendra-talur This has conflicts, can we manually create a backport PR for this?

[agarwal-mudit]

@raghavendra-talur This has conflicts, can we manually create a backport PR for this?

Created #1030