Adds StorageInitialized health check

[brendankowitz]

Description

This pull request introduces a new health check for storage initialization and includes related unit tests. Additionally, it updates project files to support these changes.

New Features:

• src/Microsoft.Health.Fhir.Api/Features/Health/StorageInitializedHealthCheck.cs: Added a new health check class StorageInitializedHealthCheck to monitor the initialization status of storage.

Unit Tests:

• src/Microsoft.Health.Fhir.Shared.Api.UnitTests/Features/Health/StorageInitializedHealthCheckTests.cs: Added unit tests for the StorageInitializedHealthCheck class to verify its behavior under different conditions.

Project File Updates:

• src/Microsoft.Health.Fhir.Api.UnitTests/Microsoft.Health.Fhir.R4.Api.UnitTests.csproj: Added a conditional package reference for Microsoft.Extensions.TimeProvider.Testing when the target framework is not net6.0.
• src/Microsoft.Health.Fhir.Shared.Api.UnitTests/Microsoft.Health.Fhir.Shared.Api.UnitTests.projitems: Included the new test file StorageInitializedHealthCheckTests.cs and removed an unused folder reference. [1] [2]

Dependency Injection:

• src/Microsoft.Health.Fhir.Shared.Api/Modules/FhirModule.cs: Registered StorageInitializedHealthCheck as a singleton service and added it to the health checks. [1] [2]

Related issues

Addresses AB#130097

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.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch

[brendankowitz]

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