Avoid hgetall deferred response

[ranshid]

In #2089 we added a deferred logic for HGETALL since we cannot anticipate the size of the output as it may contain expired hash items which should not be included.
As part of the work of #2022 this would greatly increase the time for HGETALL processing, thus we introduce this minor improvement to avoid using deferred reply in case the hash has NO volatile items.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.81%. Comparing base (992b886) to head (f153374).
⚠️ Report is 5 commits behind head on unstable.

Files with missing lines	Patch %	Lines
src/t_hash.c	90.90%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2966      +/-   ##
============================================
+ Coverage     73.73%   73.81%   +0.07%     
============================================
  Files           125      125              
  Lines         68911    69351     +440     
============================================
+ Hits          50813    51189     +376     
- Misses        18098    18162      +64     

Files with missing lines	Coverage Δ
src/t_hash.c	94.50% <90.90%> (-0.14%)	⬇️

... and 27 files with indirect coverage changes

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