src: remove unused variables from report

[iknoom]

This PR removes unused variables in node_report.cc detected by clang-tidy(bugprone-unused-local-non-trivial-variable).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.46%. Comparing base (cff138c) to head (bb421bb).
⚠️ Report is 31 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #60047 +/- ## ======================================= Coverage 88.45% 88.46% ======================================= Files 703 703 Lines 207546 207544 -2 Branches 40016 40011 -5 ======================================= + Hits 183595 183598 +3 + Misses 15956 15942 -14 - Partials 7995 8004 +9 

Files with missing lines	Coverage Δ
src/node_report.cc	93.14% <ø> (-0.03%)	⬇️

... and 38 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69407/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69411/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69414/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69459/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69468/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69503/

[nodejs-github-bot]

Landed in 36b1cc2