chore: pass rng to neighbors transformers

[flying-sheep]

• Closes #
• Tests included or not required because:

• Release notes not necessary because: internal change

[codecov]

Codecov Report

❌ Patch coverage is 93.10345% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@9e259ff). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/scanpy/neighbors/_common.py	87.50%	3 Missing ⚠️
src/scanpy/_utils/random.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4312   +/-   ##
=======================================
  Coverage        ?   80.08%           
=======================================
  Files           ?      133           
  Lines           ?    13424           
  Branches        ?        0           
=======================================
  Hits            ?    10750           
  Misses          ?     2674           
  Partials        ?        0           

Flag	Coverage Δ
hatch-test.low-vers	78.01% <93.10%> (?)
hatch-test.pre	79.95% <93.10%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/scanpy/neighbors/__init__.py	81.49% <100.00%> (ø)
src/scanpy/neighbors/_types.py	100.00% <100.00%> (ø)
src/scanpy/_utils/random.py	93.10% <90.00%> (ø)
src/scanpy/neighbors/_common.py	71.60% <87.50%> (ø)