permission: reuse cached env strings

[agape1225]

This PR replaces FIXED_ONE_BYTE_STRING(isolate, "...") literals in
src/permission/permission.cc with the Environment-cached
permission_string()/resource_string() accessors already used
elsewhere in the same file. Follow-up to #59891, which didn't cover
this file.

[nodejs-github-bot]

Review requested:

• @nodejs/security-wg

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.27%. Comparing base (b9dacd4) to head (615612e).
⚠️ Report is 179 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64912      +/-   ##
==========================================
- Coverage   90.29%   90.27%   -0.03%     
==========================================
  Files         760      760              
  Lines      247061   247061              
  Branches    46585    46587       +2     
==========================================
- Hits       223092   223035      -57     
- Misses      15451    15496      +45     
- Partials     8518     8530      +12     

Files with missing lines	Coverage Δ
src/permission/permission.cc	82.32% <100.00%> (ø)

... and 38 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75589/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75689/

[nodejs-github-bot]

Commit Queue failed

- Loading data for nodejs/node/pull/64912
✔  Done loading data for nodejs/node/pull/64912
----------------------------------- PR info ------------------------------------
Title      permission: reuse cached env strings (#64912)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     agape1225:permission-use-cached-strings -> nodejs:main
Labels     c++, author ready, needs-ci, commit-queue
Commits    1
 - permission: reuse cached env strings
Committers 1
 - agape1225 <49804691+agape1225@users.noreply.github.com>
PR-URL: https://github.com/nodejs/node/pull/64912
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/64912
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Sat, 01 Aug 2026 13:16:38 GMT
   ✔  Approvals: 2
   ✔  - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/64912#pullrequestreview-4838784169
   ✔  - Daeyeon Jeong (@daeyeon): https://github.com/nodejs/node/pull/64912#pullrequestreview-4876387866
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2026-08-09T11:58:23Z: https://ci.nodejs.org/job/node-test-pull-request/75689/
- Querying data for job/node-test-pull-request/75689/
✔  Build data downloaded
   ✔  Last Jenkins CI successful
--------------------------------------------------------------------------------
   ✔  No git cherry-pick in progress
   ✔  No git am in progress
   ✔  No git rebase in progress
--------------------------------------------------------------------------------
- Bringing origin/main up to date...
From https://github.com/nodejs/node
 * branch                  main       -> FETCH_HEAD
   ad3432189c..4a4cc1ed24  main       -> origin/main
✔  origin/main is now up-to-date
main is out of sync with origin/main. Mismatched commits:
 - ff1744022d build: deprecate always enabled `--enable-static`
 - 4a4cc1ed24 build: deprecate always enabled `--enable-static`
--------------------------------------------------------------------------------
HEAD is now at 4a4cc1ed24 build: deprecate always enabled `--enable-static`
   ✔  Reset to origin/main
- Downloading patch for 64912
From https://github.com/nodejs/node
 * branch                  refs/pull/64912/merge -> FETCH_HEAD
✔  Fetched commits as 5f1ef0a95376..615612e04c54
--------------------------------------------------------------------------------
Auto-merging src/permission/permission.cc
The previous cherry-pick is now empty, possibly due to conflict resolution.
If you wish to commit it anyway, use:
git commit --allow-empty

Otherwise, please use 'git cherry-pick --skip'

On branch main

Your branch is up to date with 'origin/main'.
You are currently cherry-picking commit 615612e04c.

(all conflicts fixed: run "git cherry-pick --continue")

(use "git cherry-pick --skip" to skip this patch)

(use "git cherry-pick --abort" to cancel the cherry-pick operation)
Untracked files:

(use "git add <file>..." to include in what will be committed)

labels.json

output
nothing added to commit but untracked files present (use "git add" to track)

✘  Failed to apply patches

https://github.com/nodejs/node/actions/runs/31401397043

[aduh95]

Superseded by 41afbd3