Remove detailed diagnostics for unsupported callable capabilities

[bamarsha]

We decided to show better diagnostics at the definition of a callable in IQ# (see #1448). For maintenance and to make the user experience consistent between result capabilities and classical computation capabilities, the old-style diagnostics explaining why a callable is not supported should be removed, e.g.:

qsharp-compiler/src/QsCompiler/SyntaxProcessor/CapabilityInference/Capabilities.fs

Lines 43 to 44 in 4e88c97

	// TODO: Remove this function as part of https://github.com/microsoft/qsharp-compiler/issues/1448.
	let explainCall (nsManager: NamespaceManager) graph target (call: Call) =

qsharp-compiler/src/QsCompiler/SyntaxProcessor/CapabilityInference/Analyzer.fsi

Lines 27 to 28 in 4e88c97

	// TODO: Remove the additional properties as part of https://github.com/microsoft/qsharp-compiler/issues/1448.
	Properties: 'props