F# compiler allows exception type names to contain reserved characters

[Windows10CE]

The exception syntax allows type identifiers that contain characters that should be banned by

fsharp/src/Compiler/SyntaxTree/PrettyNaming.fs

Lines 954 to 955 in 4afdc9f

	let IllegalCharactersInTypeAndNamespaceNames =
	[| '.'; '+'; '$'; '&'; '['; ']'; '/'; '\\'; '*'; '\"'; '`' |]

Repro steps

exception ``Te`.+$/\"st&*[]``

Expected behavior

This provides an error, same as other syntax kinds for declaring types that will appear in the metadata

Actual behavior

Compiles and emits a type with the name Te`.+$/"st&*[]

Known workarounds

N/A