[NFC][HLSL] Replace uses of `getResourceName`/`printEnum` (#152211)

Introduce the `enumToStringRef` enum into `ScopedPrinter.h` that
replicates `enumToString` behaviour, expect that instead of returning a
hex value string, it just returns an empty string. This allows us to
return a StringRef and easily check if an invalid enum was provided
based on the StringRef size

This then uses `enumToStringRef` to remove the redundant
`getResourceName` and `printEnum` functions.

Resolves: https://github.com/llvm/llvm-project/issues/151200.

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