[incubator/cassandra] Fix selector

[kostyrev]

What this PR does / why we need it:

This PR fixes

Error: release cassandra failed: StatefulSet.apps "cassandra" is invalid: [spec.selector: Required value, spec.template.metadata.labels: Invalid value: map[string]string{"app":"cassandra", "release":"cassandra"}: `selector` does not match template `labels`]

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped

[kostyrev]

ping @KongZ

[kostyrev]

There are four PRs with the same fix
#8320
#8307
#8282
#7348
Clearly there's a demand for that fix.
Could anybody merge at least one of them? Master is broken.

[KongZ]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: KongZ, kostyrev
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[k8s-ci-robot]

@KongZ: changing LGTM is restricted to assignees, and only helm/charts repo collaborators may be assigned issues.

In response to this:

/lgtm

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[KongZ]

This was look good to me but I dont' have permission to merge

[hairmare]

/assign @linki

[davidkarlsen]

/ok-to-test

[k8s-ci-robot]

@kostyrev: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-charts-e2e	6ba612c	link	/test pull-charts-e2e

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[maver1ck]

@kostyrev
I closed this bug by #8320
Thank you for contributing.

[davidkarlsen]

Closed by #8320