salt,docs: Allow to change MetalK8s UI replicas and affinity

[TeddyAndrieux]

We also bump the default number of replicas for MetalK8s UI to 2

[bert-e]

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[bert-e]

Integration data created

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• this pull request will merge improvement/allow-to-tune-metalk8s-ui-replicas into
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[bert-e]

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[JBWatenbergScality]

nit: why do we keep those commented lines ?

[TeddyAndrieux]

It's because we take this file in the documentation so that from the documentation the user can see those "example"

[TeddyAndrieux]

/approve

[bert-e]

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[bert-e]

I have successfully merged the changeset of this pull request
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