Update PR and CI to use ACA

[jestradaMS]

Description

This pull request introduces support for deploying and testing to Azure Container Apps (ACA) managed environments across PR, CI and export pipelines. The main changes include defining new variables for ACA, adding a dedicated pipeline stage to create the ACA managed environment, updating deployment and test job templates to target ACA, and ensuring consistent use of the correct resource group and key vault variables.

These changes collectively enable the pipelines to deploy to and test against Azure Container Apps, improving support for containerized workloads and aligning with modern Azure deployment practices.

Related issues

Addresses AB#181187.

Testing

Describe how this change was tested.

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• When changing or adding behavior, if your code modifies the system design or changes design assumptions, please create and include an ADR.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.94%. Comparing base (ea948f8) to head (a9f1dfe).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5477      +/-   ##
==========================================
+ Coverage   76.91%   76.94%   +0.03%     
==========================================
  Files         978      978              
  Lines       35680    35680              
  Branches     5356     5356              
==========================================
+ Hits        27443    27455      +12     
+ Misses       6903     6896       -7     
+ Partials     1334     1329       -5     

see 9 files with indirect coverage changes

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[jestradaMS]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).