feat: add _id label to all hypershift operator metrics

[typeid]

What this PR does / why we need it:

This PR adds the _id label to all the hypershift operator metrics that didn't have it yet.
For ROSA, this significantly facilitates promql queries on metrics coming from the hypershift operator and hosted clusters, as the hosted cluster metrics also contain the same _id label.
Currently, to combine metrics from HC and the hypershift operator in a query, we need to aggregate another metric containing both _id and exported_namespace. With this change, we can directly aggregate through _id.

Which issue(s) this PR fixes
Fixes #HOSTEDCP-1183 (note the ticket isn't groomed yet)

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

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[enxebre]

/approve
ptal cc @csrwng

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: enxebre, typeid

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[typeid]

/retest

[csrwng]

/lgtm

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 5e2cb1d and 2 for PR HEAD 390d8f4 in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD b81f7a3 and 1 for PR HEAD 390d8f4 in total

[openshift-ci]

@typeid: all tests passed!

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