src: fast path empty native immediate drain

[gurgunday]

RunAndClearNativeImmediates is called from CheckImmediate on every event loop tick, but most calls have no native immediates queued

• Add a fast path that checks the three queues that are drained here. If all three are empty, return before creating any V8 handles or scopes
• Use the same check in CheckImmediate, along with a JS immediate existance check, to exit even earlier

Before:

./node benchmark/run.js --filter immediate.js --set type=depth --set n=5000000 timers
timers/immediate.js
timers/immediate.js type="depth" n=5000000: 77,957.7280919732
./node benchmark/run.js --filter immediate.js --set type=depth1 --set n=5000000 timers
timers/immediate.js
timers/immediate.js type="depth1" n=5000000: 78,239.25105583081
./node benchmark/run.js --filter set-immediate-depth-args.js --set n=5000000 timers
timers/set-immediate-depth-args.js
timers/set-immediate-depth-args.js n=5000000: 77,728.55421361701

After:

./node benchmark/run.js --filter immediate.js --set type=depth --set n=5000000 timers
timers/immediate.js
timers/immediate.js type="depth" n=5000000: 81,438.54733112443
./node benchmark/run.js --filter immediate.js --set type=depth1 --set n=5000000 timers
timers/immediate.js
timers/immediate.js type="depth1" n=5000000: 81,920.65230335212
./node benchmark/run.js --filter set-immediate-depth-args.js --set n=5000000 timers
timers/set-immediate-depth-args.js
timers/set-immediate-depth-args.js n=5000000: 80,653.84783982178

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (c202696) to head (1584afc).
⚠️ Report is 479 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #62969 +/- ##
==========================================
- Coverage 89.66% 89.65% -0.02% 
==========================================
Files 706 706 Lines 219416 219424 +8 Branches 42073 42077 +4 ==========================================
- Hits 196738 196718 -20 - Misses 14576 14591 +15 - Partials 8102 8115 +13 

Files with missing lines	Coverage Δ
src/env.cc	85.31% <100.00%> (-0.22%)	⬇️
src/env.h	98.14% <ø> (ø)

... and 21 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73989/

[nodejs-github-bot]

Landed in 4fb667e

[aduh95]

This doesn't land cleanly on v24.x-staging, it would require a manual backport PR if we want it on Node.js 24