DM-40390: Remove TYPE_CHECKING block to fix DatastoreRecordData import

[timj]

There was a code path that was using the class but which failed because it was only imported during type checking.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch coverage: 94.11% and project coverage change: +1.50% 🎉

Comparison is base (9254431) 85.50% compared to head (f5de634) 87.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   85.50%   87.00%   +1.50%     
==========================================
  Files          47       47              
  Lines        4269     4301      +32     
  Branches      601      745     +144     
==========================================
+ Hits         3650     3742      +92     
+ Misses        462      404      -58     
+ Partials      157      155       -2     

Files Changed	Coverage Δ
python/lsst/ctrl/mpexec/cmdLineFwk.py	71.84% <ø> (+8.74%)	⬆️
tests/test_cmdLineFwk.py	98.06% <94.11%> (-0.29%)	⬇️

... and 3 files with indirect coverage changes

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