[ACA] [357253] Add note that App Insights must allow local auth for OTel

[v-jaswel]

PR review team: please do not review or merge this PR until the author (craigshoemaker) signs off. Thank you!

[prmerger-automator]

@v-jaswel : 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 631caaf:

✅ Validation status: passed

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articles/container-apps/opentelemetry-agents.md	✅Succeeded
articles/container-apps/troubleshoot-image-pull-failures.md	✅Succeeded

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit d02f96f:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/container-apps/opentelemetry-agents.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[Court72]

@craigshoemaker

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