scaleway: refactoring: utils functions to get info from tags

[Mia-Cross]

This PR adds 3 new utils functions to get:

• the cluster's name
• the instance's role
• the instance's instance group name

from the given tags.

This avoids a few for _, tag := range tags type loops.

[k8s-ci-robot]

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[hakman]

/ok-to-test

[johngmyers]

This is a good refactor. You could refine it further with something like:

func TagValue(server *instance.Server, prefix string) string {

[k8s-ci-robot]

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