[metrics_server]: Enabled HA mode by adding 'metrics_server_replicas'…

[ugur99]

Signed-off-by: Ugur Can Ozturk ugurozturk918@gmail.com

What type of PR is this?
/kind feature

What this PR does / why we need it:
We were looking for a parameter to deploy metrics_server in HA mode with KubeSpray and discovered the issue; wanted to contribute with this PR.

The small feature provides usage of metrics_server in HA mode by manipulating the number of replicas, also nodeAffinity rule which prioritizes running replicas on control_planes was removed, and instead of it, the podAntiAffinity rule was added.

Which issue(s) this PR fixes:

Fixes #9197

Special notes for your reviewer:
Tested by installing a new cluster.

Does this PR introduce a user-facing change?:

Add variable in metrics_server deployment (`metrics_server_replicas`) to enable HA mode

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ugur99 / name: Ugur Can Ozturk (8a022e9)

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[k8s-ci-robot]

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[yankay]

/ok-to-test

[floryut]

@ugur99 Thank you for the PR!
That's a good feature to bring back from the dead 🧟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, ugur99

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[yankay]

Thanks @ugur99 very much

/lgtm