Create changelog for v1.22.0 release

[Copilot]

Prepare release notes for v1.22.0 by processing merged PRs since v1.21.3.

Changes

• CHANGELOG.md: Add v1.22.0 release section with categorized entries:

  • Features: Faster provisioning progress updates (3s polling vs 10s); add .gitignore templates for extension scaffolding
  • Bugs: Fix hooks failing in CI/CD without .azure directory; fix revision-based Container Apps deployment; fix panic in azd provision --preview; fix provision skipping when resource groups deleted externally; relax Aspire binding validation for non-HTTP protocols
  • Other: Bicep CLI v0.39.26; Azure AI Foundry → Microsoft Foundry rename

• version.txt: Bump from 1.22.0-beta.1 to 1.22.0

Excluded per guidelines

Internal refactors (#6193, #6253), extension-only changes, automated dependency bumps, CI/CD infra updates.

• Fixes Create changelog for v1.22.0 release #6298

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create changelog for v1.22.0 release</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create changelog for v1.22.0 release #6298

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[JeffreyCA]

@copilot could you include these recently merged PRs as well?

#6282
#6180
#6281

[Copilot]

@copilot could you include these recently merged PRs as well?

#6282
...

Added all three PRs to the changelog in commit fa4f6ed:

• Fix nil panic in provision preview when ARM returns nil After field #6282: Fix panic in azd provision --preview when ARM returns nil After field
• invalidate deployment state based on resource group existence checks #6281: Fix azd provision skipping deployment when resource groups were deleted
• [Aspire] Relax binding validating for non http as simple tcp #6180: Relax Aspire binding validation for non-HTTP protocols

[hemarina]

@copilot Include new merged PR #6232

[Copilot]

@copilot Include new merged PR #6232

Added PR #6232 to the Features Added section in commit 204f0f0.