SignalR source generators shouldn't include Compilation in the pipeline

[Youssef1313]

See dotnet/roslyn-analyzers#6352

These pipelines are not efficient and this generator is not really incremental.

aspnetcore/src/SignalR/clients/csharp/Client.SourceGenerator/src/HubClientProxyGenerator.cs

Lines 15 to 32 in d2f7bd0

	var methodDeclaration = context.SyntaxProvider
	.CreateSyntaxProvider(static (s, _) => Parser.IsSyntaxTargetForAttribute(s),
	static (ctx, _) => Parser.GetSemanticTargetForAttribute(ctx))
	.Where(static m => m is not null)
	.Collect();
	var memberAccessExpressions = context.SyntaxProvider
	.CreateSyntaxProvider(static (s, _) => Parser.IsSyntaxTargetForGeneration(s),
	static (ctx, _) => Parser.GetSemanticTargetForGeneration(ctx))
	.Where(static m => m is not null);
	var compilationAndMethodDeclaration = context.CompilationProvider.Combine(methodDeclaration);
	var payload = compilationAndMethodDeclaration
	.Combine(memberAccessExpressions.Collect());
	context.RegisterSourceOutput(payload, static (spc, source) =>
	Execute(source.Left.Left, source.Left.Right, source.Right, spc));

aspnetcore/src/SignalR/clients/csharp/Client.SourceGenerator/src/HubServerProxyGenerator.cs

Lines 15 to 32 in d2f7bd0

	var methodDeclaration = context.SyntaxProvider
	.CreateSyntaxProvider(static (s, _) => Parser.IsSyntaxTargetForAttribute(s),
	static (ctx, _) => Parser.GetSemanticTargetForAttribute(ctx))
	.Where(static m => m is not null)
	.Collect();
	var memberAccessExpressions = context.SyntaxProvider
	.CreateSyntaxProvider(static (s, _) => Parser.IsSyntaxTargetForGeneration(s),
	static (ctx, _) => Parser.GetSemanticTargetForGeneration(ctx))
	.Where(static m => m is not null);
	var compilationAndMethodDeclaration = context.CompilationProvider.Combine(methodDeclaration);
	var payload = compilationAndMethodDeclaration
	.Combine(memberAccessExpressions.Collect());
	context.RegisterSourceOutput(payload, static (spc, source) =>
	Execute(source.Left.Left, source.Left.Right, source.Right, spc));

Every typed character in IDE will produce a new compilation and the whole thing will re-run. This doesn't benefit from being incremental.