chore: Add more tests for special characters in route matching

[brophdawg11]

Adds some more thorough tests around route matching on special characters (symbols, emojis, umlauts, wide characters, etc.) after the changes in #9300 to remove the word boundary from the regex. Any obvious other chars I'm missing?

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[mjackson]

LGTM 👍

[brophdawg11]

Closing in favor of a more comprehensive PR I'm about to push