Add diagnostic provider for clients without dynamic registration

[SofusA]

Closes #76624

[SofusA]

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[dibarbet]

Apologies for the delay here

[dibarbet]

This test doesn't seem quite complete - adding the test parameter is fine (or it could be a separate test), but I would expect the test to assert that no dynamic capabilities (and no separate sources) are registered when the client does not support dynamic registration.

Instead I would expect the test to assert that there is only the single static registration.

[SofusA]

Sorry. I pushed this change before i was able to run the test by mistake.
The registrations are empty without dynamic registration, which i think makes sense.

I suppose i should look up the server capabilities somehow. Could you guide me in the right direction?

No worries with the delay. I just appreciate that you take the time.

[dibarbet]

The registrations are empty without dynamic registration, which i think makes sense.

Yup I believe so.

I suppose i should look up the server capabilities somehow. Could you guide me in the right direction?

On the testLspServer instance, you should be able to call GetServerCapabilities - https://github.com/dotnet/roslyn/blob/main/src/LanguageServer/Protocol.TestUtilities/LanguageServer/AbstractLanguageServerProtocolTests.cs#L791

[SofusA]

Thanks.

I have added an if / else on dynamicRegistration. Would you prefer an early return in the test instead?

[dibarbet]

lgtm!