test_runner: unify --require and --import behavior when isolation none

[pmarchini]

I'm opening this PR as a draft to discuss the implementation.
The goal is to address issue #57728.
This PR unifies the behaviour of --require and --import for the specific case where the test runner is run with isolation none.

[nodejs-github-bot]

Review requested:

• [ ] @nodejs/test_runner

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 90.19%. Comparing base (52d95f5) to head (b866b7e). :warning: Report is 1091 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57924      +/-   ##
==========================================
- Coverage   90.26%   90.19%   -0.07%     
==========================================
  Files         630      630              
  Lines      185933   186470     +537     
  Branches    36450    36624     +174     
==========================================
+ Hits       167829   168186     +357     
- Misses      10972    11061      +89     
- Partials     7132     7223      +91     

Files with missing lines	Coverage Δ
lib/internal/main/test_runner.js	100.00% <100.00%> (ø)
lib/internal/process/pre_execution.js	94.91% <100.00%> (-1.05%)	:arrow_down:
lib/internal/test_runner/runner.js	89.03% <100.00%> (+0.15%)	:arrow_up:

... and 71 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/66519/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66540/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66550/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66557/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66558/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66559/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66561/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66563/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66571/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66572/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66580/

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CI: https://ci.nodejs.org/job/node-test-pull-request/66595/

[nodejs-github-bot]

Landed in 7e24ebc78079bc7551b6dd96e1f0d249f4599605

[richardlau]

This doesn't land cleanly on v22.x-staging so a manual backport will be necessary if this is to be released there.