Add Azure CLI 2.90.0 App Service updates

[Byron Tardif (btardif)]

Summary

Adds a September 1, 2026 blog post covering the App Service improvements in Azure CLI 2.90.0, including:

• Cross-platform interactive shell and detached command execution with az webapp exec
• SSH security controls and Azure Policy governance
• Linux network capture collection
• Friendly deployment names
• Enriched web app creation errors
• Isolated v4 plan support
• Configuration and plan usability fixes

[github-actions]

Preview link: https://antares-blog-staging-pr-558.azurewebsites.net

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Pull request overview

Adds a new Azure App Service team blog post announcing and explaining Azure CLI 2.90.0 App Service improvements, with usage examples for new/updated commands.

Changes:

• Introduces a new post describing az webapp exec (interactive + detached execution) and related SSH governance controls.
• Documents new/updated troubleshooting and deployment capabilities (Linux network capture collection, deployment tagging, enriched creation errors).
• Highlights Isolated v4 plan SKU support plus configuration/usability fixes.

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[Byron Tardif (btardif)]

Thanks for the review Jordan Selig (@seligj95) merging this now.

CC: tulikac Andrew Westgarth (@apwestgarth)