Fix versioned canonical profile resolution

[rohithkg-code]

Description

Fix versioned canonical profile resolution for validation-backed profile lookup.

This change updates ServerProvideProfileValidation.ResolveByCanonicalUriAsync so that when a profile is referenced using a versioned canonical URI such as http://example.org/fhir/StructureDefinition/custom-patient|3.0.0, the resolver can match it against the stored StructureDefinition by canonical URL plus version.

Without this fallback, versioned profile references could fail resolution even when the corresponding StructureDefinition was present on the server.

This PR also adds focused unit tests covering:

• returning versioned supported profile URLs
• resolving a versioned canonical URI to the correct StructureDefinition

Related issues

Addresses #5176.

Testing

Code changes were validated by adding targeted unit tests in ServerProvideProfileValidationTests for:

• GivenVersionedStructureDefinition_WhenGettingSupportedProfiles_ThenVersionedCanonicalIsReturned
• GivenVersionedStructureDefinition_WhenResolvingByCanonicalUriWithVersion_ThenMatchingProfileIsReturned

Planned test command:

dotnet test src\Microsoft.Health.Fhir.R4.Core.UnitTests\Microsoft.Health.Fhir.R4.Core.UnitTests.csproj --filter ServerProvideProfileValidationTests

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[feordin]

Thanks for the contribution!

I have a question on this method:
It appears that this fallback only works correctly if at most one version of each StructureDefinition exists on the server.

_summaries is built in GetSummariesAsync using result[artifact.ResourceUri] = artifact — keyed on the base canonical URL with no version. When a server holds both v2.0.0 and v3.0.0 of the same SD, only the last one processed survives in _summaries, so url|2.0.0 will silently fail to resolve if v3.0.0 was stored last.

I think to fully support multi-version scenarios, GetSummariesAsync needs to key the dictionary by url + version (e.g. $"{artifact.ResourceUri}|{ver}"), and LoadBySummary's cache key needs the same treatment (see separate comment).

[feordin]

I think, if we fix the first comment I made, we will have a new issue:
The _resourcesByUri cache key doesn't include version, so it will return the wrong resource once multi-version support is added.

Steps to reproduce (after fixing the deduplication bug above):

ResolveByCanonicalUriAsync("url|v2") → loads v2 from JSON → stores in cache under key url
ResolveByCanonicalUriAsync("url|v3") → cache hit on url → returns v2 incorrectly

[feordin]

More possible test cases:
Version mismatch returns null — call ResolveByCanonicalUriAsync("url|9.9.9") when only url|3.0.0 exists; assert the result is null. This ensures the fallback doesn't match on URL alone.

Unversioned URI still resolves — regression guard that an unversioned canonical URI resolves correctly after the restructured code path in ResolveByCanonicalUriAsync.

Two versions of the same SD, each resolves correctly — a test with both v2.0.0 and v3.0.0 of the same SD on the server, verifying each versioned URI resolves to the right resource. This will also expose the deduplication/cache bugs noted above.