update multi-tenacy docs

[davidblum]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This PR updates documentation around multi-tenancy, and provides a working yaml sample of cross account provisioning.

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

Documentation update for multi-tenancy

This update provides:
- clarity on how `identityRef` directs which cluster CAPA deploys into
- updates on examples
- working / apply-able yaml example

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: davidblum / name: David Blum (64d6f8223331f44bc6ddc18a6e7f7f354e7af812)

[k8s-ci-robot]

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[k8s-ci-robot]

@davidblum: This issue is currently awaiting triage.

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[k8s-ci-robot]

Hi @davidblum. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sedefsavas]

/ok-to-test

[davidblum]

/check-cla

[pydctw]

Thanks for the PR, @davidblum. The example and permission sections are very well-written 👏

[pydctw]

thanks for the updates. could you squash the commit?
/lgtm

[pydctw]

/lgtm

[sedefsavas]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sedefsavas

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