Add startup troubleshooter

[sdwheeler]

PR Summary

Add startup troubleshooter

• Fixes AB#537041

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributor's guide.
• Style: This PR adheres to the style guide.

[michaeltlombardi]

Minor corrections, otherwise LGTM!

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit f4298d3:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/dev-cross-plat/performance/startup-performance.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit bdc357e:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/dev-cross-plat/performance/startup-performance.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.