test: reduce the allocation size in test-worker-arraybuffer-zerofill

[jasnell]

Test has been flaky with timeouts in CI. This is possibly due to the repeated large allocations on the main thread. This commit reduces the allocation size and makes a number of other cleanups. The main goal is to hopefully make this test more reliable / not-flaky.

Also move the test to sequential. The frequent large allocations could be causing the test to be flaky if run parallel to other tests.

Refs: #52274

update: I realized after that it wasn't clear what was meant by "reduce the allocation size" here. The actual allocation on each iteration remains the same, but by waiting to start allocating until the worker reports the "online" event we reduce (albeit slightly) the number of allocations that are done overall. In local testing this reduced the actually number of allocation calls by a fair amount, reducing the amount of memory the test was using. Unfortunately I don't think just doing that is enough to moving the test to sequential should hopefully also help.

[lpinca]

As written elsewhere I really see no reason to refactor this kind of tests to use node:test. In my opinion it is only added complexity and additional code that might interfere with what should be actually tested. The original design of using only the code strictly required for the test was great. There is no better way to write and run tests in my opinion. That said, I'm not blocking.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.06%. Comparing base (123bb4c) to head (49d5078).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #54839      +/-   ##
==========================================
- Coverage   88.07%   88.06%   -0.01%     
==========================================
  Files         651      651              
  Lines      183396   183396              
  Branches    35795    35798       +3     
==========================================
- Hits       161523   161515       -8     
+ Misses      15161    15159       -2     
- Partials     6712     6722      +10     

see 29 files with indirect coverage changes

[jasnell]

The stress test looks good.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/62323/ 💛

[mcollina]

lgtm

[jasnell]

Landed in 4b2cab2

[lpinca]

Some tests time out due to a deadlock during process shutdown, see #52550 (comment). I think that the underlying issue is the same here. We could revert/revisit this when a fix lands.