Fixes #12973 - Document $Profile limitations for MSIX

[sdwheeler]

PR Summary

Document $Profile limitations for MSIX

• Fixes AB#574257
• Fixes $profile.AllUsersAllHosts is not modifiable for PowerShell with the MSIX installation #12973

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.

[Copilot]

Pull request overview

Updates PowerShell Windows installation and profile documentation to clarify limitations of MSIX/Microsoft Store installs, specifically around all-users profile locations and $PSHOME write restrictions.

Changes:

• Adds MSIX profile limitations to the Windows install guidance.
• Adds an “MSIX-based installations” section to about_Profiles for PowerShell 7.4–7.7.
• Refreshes ms.date metadata on the touched pages.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
reference/docs-conceptual/install/install-powershell-on-windows.md	Documents MSIX sandbox/root-folder limitations and calls out inability to create all-users profiles.
reference/7.7/Microsoft.PowerShell.Core/About/about_Profiles.md	Adds MSIX-specific guidance about all-users vs current-user profiles.
reference/7.6/Microsoft.PowerShell.Core/About/about_Profiles.md	Adds MSIX-specific guidance about all-users vs current-user profiles.
reference/7.5/Microsoft.PowerShell.Core/About/about_Profiles.md	Adds MSIX-specific guidance about all-users vs current-user profiles.
reference/7.4/Microsoft.PowerShell.Core/About/about_Profiles.md	Adds MSIX-specific guidance about all-users vs current-user profiles.

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[learn-build-service-prod]

Learn Build status updates of commit 78f0d7c:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/Microsoft.PowerShell.Core/About/about_Profiles.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Core/About/about_Profiles.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Core/About/about_Profiles.md	✅Succeeded	View (powershell-7.6)
reference/7.7/Microsoft.PowerShell.Core/About/about_Profiles.md	✅Succeeded	View (powershell-7.7)
reference/docs-conceptual/install/install-powershell-on-windows.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.