process: add process.entrypoint

[avivkeller]

Fixes: #51840

Adds a process.entrypoint non-configurable property to the process object during bootstrap. This property reflects the executable's main entrypoint (i.e. not --require or --import-ed files, the main file).

Additionally, this entrypoint is passed to workers, so it reflects the entrypoint of the process that created the worker, not the entrypoint of the worker itself.

[nodejs-github-bot]

Review requested:

• @nodejs/loaders

[avivkeller]

@nodejs/process

[mcollina]

in worker threadsx this is set to the entrypoint of the worker?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.12%. Comparing base (6a3d80f) to head (992b11a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64800      +/-   ##
==========================================
- Coverage   90.16%   90.12%   -0.05%     
==========================================
  Files         744      744              
  Lines      242518   242571      +53     
  Branches    45705    45695      -10     
==========================================
- Hits       218670   218615      -55     
- Misses      15357    15443      +86     
- Partials     8491     8513      +22     

Files with missing lines	Coverage Δ
lib/internal/main/worker_thread.js	94.46% <100.00%> (+0.11%)	⬆️
lib/internal/process/pre_execution.js	98.13% <100.00%> (+0.16%)	⬆️
lib/internal/worker.js	96.75% <100.00%> (+<0.01%)	⬆️

... and 38 files with indirect coverage changes

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[avivkeller]

in worker threadsx this is set to the entrypoint of the worker?

This is set to the entrypoint of the process that created the worker, not the worker itself. So if /my/path/index.js creates /my/worker/index.js, entrypoint will a URL of /my/path/index.js.