test: cover delimiters inside an async method signature

[DylanPiercey]

Adds fixtures where a string, template, regex, comment or type parameter inside an async shorthand method's signature contains the characters that delimit it. The parser already handles these; the coverage exists because a consumer scanning the signature by counting delimiters gets them wrong.

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Latest commit: 5b22d24

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⛔ Files ignored due to path filters (1)

• src/__tests__/fixtures/attr-method-shorthand-async/__snapshots__/attr-method-shorthand-async.expected.txt is excluded by !**/__snapshots__/** and included by **

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (d648b57) to head (5b22d24).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files          34       34           
  Lines        4558     4558           
  Branches      874      874           
=======================================
  Hits         4556     4556           
  Misses          2        2           

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