fix(analyzer): script block detection in vue and svelte files

[Sec-ant]

Summary

Fix the regexes we use for script block detection in .vue and .svelte files to support generic components in .vue files.

Closes #2456.

Test Plan

Added a test case borrowed from #2456.

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[nhedger]

Some of the unit tests (in regex101) are failing: https://regex101.com/r/E4n4hh/6 (see Unit Tests section), not sure what the impact is.

Edit: seems to have been the case in previous versions too, may it's just outdated.

[Sec-ant]

Some of the unit tests (in regex101) are failing: https://regex101.com/r/E4n4hh/6 (see Unit Tests section), not sure what the impact is.

Thank you for pointing that out! I didn't even know that there're unit tests in regex101. But I think those are false alarms because I've changed the capture groups and we're now using the JSX parser for the attributes instead of using regex capture groups. So I think we're fine here.