Add Microsoft.Mission spec to public repo

[jchavaherrera]

ARM (Control Plane) API Specification Update Pull Request

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• New resource provider.
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  • New resource provider in azure-rest-api-specs. This RP exists already in azure-rest-api-specs-pr/RPSaaSMaster

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• I confirm this PR is modifying Azure Resource Manager (ARM) related specifications, and not data plane related specifications.
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PR validation pipeline restarted successfully. If there is ApiView generated, it will be updated in this comment.

[azure-sdk]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
TypeSpec	Microsoft.Mission
JavaScript	@azure/arm-virtualenclaves
Python	azure-mgmt-virtualenclaves
Java	com.azure.resourcemanager:azure-resourcemanager-virtualenclaves
Go	sdk/resourcemanager/virtualenclaves/armvirtualenclaves

[jchavaherrera]

We are having the error [MISSING_APIS_IN_DEFAULT_TAG], this is being caused by a deprecated version of the API, we would like to have that error suppressed

[tgoodyear]

Pending approval from Microsoft.Mission leadership team to approve transition to Public Preview

[tgoodyear]

This PR moves the specs from azure-rest-api-specs-pr into azure-rest-api-specs as part of the process for moving towards Public Preview. There are no differences between the spec in azure-rest-api-specs-pr/RPSaaSMaster and this PR. Feature control is maintained by AFEC, will not be removed until all other Public Preview gates are satisfied.

As discussed in the azure-rest-api-specs-pr comments, Avocado is suppressed since it does not handle moves/renames. Some operations were renamed in 2025-05-01-preview.

[gary-x-li]

Can you fix the TypeSpec Validation failure?

[jchavaherrera]

Can you fix the TypeSpec Validation failure?

@gary-x-li We fix the TypeSpec Validation