Change lld target to lldWasm target Emscripten build

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

Just like #531 did for the clang target, this PR swaps out the lld target for the lldWasm target, speeding up the Emscripten llvm build time, and reducing the size the build takes up in the cache.

Fixes # (issue)

Type of change

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• Bug fix
• New feature
• Requires documentation updates

Testing

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.71%. Comparing base (7d9be77) to head (0a18996).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #532   +/-   ##
=======================================
  Coverage   72.71%   72.71%           
=======================================
  Files           9        9           
  Lines        3618     3618           
=======================================
  Hits         2631     2631           
  Misses        987      987           

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