Add infobox warning that PIM activation disconnects Teams Mobile

[rgsteele]

See Microsoft Support issue ID 2405310040009148 for further details and confirmation.

[prmerger-automator]

@rgsteele : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 6139874:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/id-governance/privileged-identity-management/pim-how-to-activate-role.yml	✅Succeeded

For more details, please refer to the build report.

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[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[Jak-MS]

@barclayn
Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[rgsteele]

Hi @barclayn, did you need any further clarification from me on this?