fix(DataStore): SyncMutationToCloudOperationTests thread sanitizer bug

[wooj2]

Addresses bug filed here:
#914

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #915 (652aa3a) into main (ff776df) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
- Coverage   67.27%   67.27%   -0.01%     
==========================================
  Files         895      895              
  Lines       35372    35372              
==========================================
- Hits        23796    23795       -1     
- Misses      11576    11577       +1     

Flag	Coverage Δ
API_plugin_unit_test	62.49% <ø> (-0.08%)	⬇️
Analytics_plugin_unit_test	72.38% <ø> (ø)
Auth_plugin_unit_test	48.62% <ø> (ø)
DataStore_plugin_unit_test	83.03% <100.00%> (ø)
Predictions_plugin_unit_test	49.49% <ø> (ø)
Storage_plugin_unit_test	74.74% <ø> (ø)
build_test_amplify	63.13% <ø> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
...ationQueue/SyncMutationToCloudOperationTests.swift	93.71% <100.00%> (ø)
...lugin/Operation/AWSAPIOperation+APIOperation.swift	78.37% <0.00%> (-5.41%)	⬇️
...s/AWSHubPlugin/Internal/HubChannelDispatcher.swift	94.11% <0.00%> (-2.95%)	⬇️
.../DataStore/Model/Internal/Schema/ModelSchema.swift	85.29% <0.00%> (+2.94%)	⬆️
Amplify/Categories/Hub/HubFilter.swift	57.89% <0.00%> (+5.26%)	⬆️

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