src: fix live lock between environments with blocked requests

[IlyasShabi]

LockManager::ProcessQueue() woke every other env with any pending request, even when none of those requests could make progress. Two envs with requests blocked on the same resource would wake each other back and forth forever.

This PR will wake another env only when one of its requests can make progress:

• the request is grantable or
• it uses ifAvailable, which must run its callback with null when the resource is unavailable.

Fixes #62644

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.15%. Comparing base (cb9bb66) to head (769b088).
⚠️ Report is 239 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_locks.cc	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65520      +/-   ##
==========================================
- Coverage   90.31%   90.15%   -0.17%     
==========================================
  Files         760      751       -9     
  Lines      248532   253587    +5055     
  Branches    46908    47781     +873     
==========================================
+ Hits       224467   228622    +4155     
- Misses      15505    16214     +709     
- Partials     8560     8751     +191     

Files with missing lines	Coverage Δ
src/node_locks.cc	75.14% <50.00%> (+2.47%)	⬆️

... and 216 files with indirect coverage changes

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