wasm: Revert enable JSPI as already enabled

[guybedford]

This reverts #59941, while keeping the test for good measure.

It turns out JSPI is already enabled on latest V8, I was just not carefully testing this between different versions.

#59941 should be considered fully reverted and backed out with this change.

[nodejs-github-bot]

Review requested:

• @nodejs/startup

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.46%. Comparing base (3312e4e) to head (c273e58).
⚠️ Report is 92 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60014      +/-   ##
==========================================
- Coverage   88.47%   88.46%   -0.02%     
==========================================
  Files         703      703              
  Lines      207546   207545       -1     
  Branches    40006    40015       +9     
==========================================
- Hits       183631   183601      -30     
- Misses      15907    15946      +39     
+ Partials     8008     7998      -10     

Files with missing lines	Coverage Δ
src/node.cc	75.77% <ø> (-0.04%)	⬇️

... and 31 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69373/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69380/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69405/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69496/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69500/

[guybedford]

Landed in 23b8340.