doc: add test_runner to subsystem

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Review requested:

• [ ] @nodejs/tsc

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Fast-track has been requested by @rluvaton. Please 👍 to approve.

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----------------------------------- PR info ------------------------------------
Title      doc: add test_runner to subsystem (#52774)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     rluvaton:add-test-runner-to-subsystem -> nodejs:main
Labels     doc, fast-track, test_runner
Commits    1
 - doc: add test_runner to subsystem
Committers 1
 - GitHub 
PR-URL: https://github.com/nodejs/node/pull/52774
Reviewed-By: Moshe Atlow 
Reviewed-By: Luigi Pinca 
Reviewed-By: Yagiz Nizipli 
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/52774
Reviewed-By: Moshe Atlow 
Reviewed-By: Luigi Pinca 
Reviewed-By: Yagiz Nizipli 
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   ℹ  This PR was created on Wed, 01 May 2024 12:00:06 GMT
   ✔  Approvals: 3
   ✔  - Moshe Atlow (@MoLow) (TSC): https://github.com/nodejs/node/pull/52774#pullrequestreview-2033520194
   ✔  - Luigi Pinca (@lpinca): https://github.com/nodejs/node/pull/52774#pullrequestreview-2033531055
   ✔  - Yagiz Nizipli (@anonrig) (TSC): https://github.com/nodejs/node/pull/52774#pullrequestreview-2033549041
   ℹ  This PR is being fast-tracked
   ✘  This PR needs to wait 46 more hours to land (or 0 hours if there is 1 more approval (👍) of the fast-track request from collaborators).
   ✔  Last GitHub CI successful
   ℹ  Green GitHub CI is sufficient
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   ✔  Aborted `git node land` session in /home/runner/work/node/node/.ncu

https://github.com/nodejs/node/actions/runs/8910088175

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Landed in 956521c767e9bad13f7737c518ad5ce368c349c2