hash: pause auto-shrink during HGETDEL

[charsyam]

Match HGETDEL with the existing batch-delete pattern used by HDEL.

HDEL already pauses hashtable auto-shrink while deleting multiple fields so shrink evaluation is deferred until the batch completes. HGETDEL was missing the same optimization even though it also deletes fields in a loop.

Pause auto-shrink for hashtable-encoded hashes before the HGETDEL delete loop and resume it once afterwards. This preserves observable behavior and reduces redundant shrink work for multi-field deletes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.46%. Comparing base (4a42c95) to head (7d82364).

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #3535      +/-   ##
============================================
+ Coverage     76.40%   76.46%   +0.06%     
============================================
  Files           159      159              
  Lines         79851    79853       +2     
============================================
+ Hits          61008    61062      +54     
+ Misses        18843    18791      -52     

Files with missing lines	Coverage Δ
src/t_hash.c	95.40% <100.00%> (+<0.01%)	⬆️

... and 23 files with indirect coverage changes

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