Fix memory leak in the new hashtable unittest

[enjoy-binbin]

There is a leak in here, hashtableTwoPhasePopDelete won't call the entry destructor and like hashtablePop we need to call it by myself.

[enjoy-binbin]

https://github.com/valkey-io/valkey/actions/runs/12267010712/job/34226298525#step:10:431 leak:

==73624==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 3033 byte(s) in 200 object(s) allocated from:
    #0 0x7ff5688b4887 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
    #1 0x55f3c8fb055a in create_keyval unit/test_hashtable.c:36
    #2 0x55f3c8fb055a in test_two_phase_insert_and_pop unit/test_hashtable.c:273
    #3 0x55f3c8feda08 in runTestSuite unit/test_main.c:26
    #4 0x55f3c8f981a1 in main unit/test_main.c:61
    #5 0x7ff568[429](https://github.com/valkey-io/valkey/actions/runs/12267010712/job/34226296249#step:10:430)d8f  (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.90%. Comparing base (3eb8314) to head (0cc6d8c).
Report is 1 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1421      +/-   ##
============================================
+ Coverage     70.88%   70.90%   +0.01%     
============================================
  Files           119      119              
  Lines         64652    64652              
============================================
+ Hits          45831    45843      +12     
+ Misses        18821    18809      -12     

see 11 files with indirect coverage changes

[zuiderkwast]

Thanks!