[Microsoft.App] Planned Maintenance feature for managed environment

[jijohn14]

ARM (Control Plane) API Specification Update Pull Request

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• New resource provider.
• New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to OpenAPI specs PR creation guidance).
• Update existing version for a new feature. (This is applicable only when you are revising a private preview API version.)
• Update existing version to fix OpenAPI spec quality issues in S360.
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  • edit this with your clarification

Due diligence checklist

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• I confirm this PR is modifying Azure Resource Manager (ARM) related specifications, and not data plane related specifications.
• I have reviewed following Resource Provider guidelines, including
  ARM resource provider contract and
  REST guidelines (estimated time: 4 hours).
  I understand this is required before I can proceed to the diagram Step 2, "ARM API changes review", for this PR.

Additional information

Viewing API changes

For convenient view of the API changes made by this PR, refer to the URLs provided in the table
in the Generated ApiView comment added to this PR. You can use ApiView to show API versions diff.

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[openapi-pipeline-app]

Next Steps to Merge

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[openapi-pipeline-app]

Generated ApiView

Language	Package Name	ApiView Link
JavaScript	@azure/arm-appcontainers	https://apiview.dev/Assemblies/Review/ba41cd9978b542efb0688a072b2319a1?revisionId=33149dccffda4d3f80e8f827f58556ea
Java	azure-resourcemanager-appcontainers	https://apiview.dev/Assemblies/Review/7da9ac1e2db64477ada2ba8bbb71169b?revisionId=9ccff19645b143cca87566a55e2a048e
Swagger	Microsoft.App	https://apiview.dev/Assemblies/Review/53999dbad23b45cba7812a00a713cab8?revisionId=42c2781528bf4366bff932df565afb6b

[ms-bogdan-rotaru]

Please fix the errors reported by the required checks.

[rkmanda]

[jijohn14]

/pr RequestMerge

[Juliehzl]

is it a long running operation? It is recommended to make it as an async call because the change from sync call to async will be complicated.