Fix topic subscription path patterns #1592
Merged
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Zawinski's Law strikes again!
Fix bug introduced in #1580, and surfaced in the system test failures following its merge.
Project IDs have embedded hyphens; topic / subscription names can have other punctuation.
This commit doesn't attempt to enforce the allowed punctuation, because we aren't validation user input with these patterns: we only use them to parse out project IDs / topic names / subscription names from values emitted by the back-end.