Adding information about update latency to the firewall page

[jgordon123]

This change adds information about update latency in the azure system related to security change propagation, and offers guidance about how to mitigate that latency in critical situations.

[learn-build-service-prod]

Learn Build status updates of commit 50fb612:

✅ Validation status: passed

File	Status	Preview URL	Details
azure-sql/database/firewall-configure.md	✅Succeeded

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[prmerger-automator]

@jgordon123 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[v-dirichards]

@VanMSFT

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

[VanMSFT]

checking internally