Backport of cloud: document resource k/v tag usage into v1.10

[github-actions]

Backport

This PR is auto-generated from #35942 to be assessed for backporting due to the inclusion of the label 1.10-backport.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@brandonc
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "600848fc93222fc37bac22ca915a8c1457440b58", automatic backport requires rebase workflow

The below text is copied from the body of the original PR.

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Adds supplemental documentation for the usage of key/value tags as an alternative to list of key-only strings in the cloud block

Target Release

1.10.0

Draft CHANGELOG entry

NEW FEATURES

• cloud: cloud block now allows map of strings to be used as workspace key/value tags

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Overview of commits

• 769e15b

• a1d179d

• 600848f

• 5f83beb

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.