Add BulkShardRequest Serialization Test

[jchrys]

Description

Add BulkShardRequest Serialization Test

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

✅ Gradle check result for 93fdaaa: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.19%. Comparing base (1b4a817) to head (93fdaaa).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17057      +/-   ##
============================================
- Coverage     72.23%   72.19%   -0.04%     
- Complexity    65292    65305      +13     
============================================
  Files          5301     5301              
  Lines        303823   303823              
  Branches      44033    44033              
============================================
- Hits         219454   219335     -119     
- Misses        66344    66508     +164     
+ Partials      18025    17980      -45     

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