Fix Ruby files causing the CLI to hang

[thecrypticace]

Fixes #17379

The preprocessor we added to detect embedded languages uses a back reference and given a long enough file with certain byte / character patterns it'll cause what appears to be an indefinite hang (might just be catastrophically exponential backtracking but not sure)

This replaces the one regex w/ back references with two, anchored, multi-line regexes

Now we search for all the starting & ending delimiters in the file. We then loop over all the starting delimiters, find the paired ending one, and preprocess the content inside

[thecrypticace]

I didn't put this test case in because it's kinda absurd but this froze previously with the old regex — yes the indentation is like that on purpose:

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