test: cover implementation bridge accessor initialization

[amirdeljouyi]

Description

Hi,

This PR adds focused unit coverage for ImplementationBridgeHelpers.

It covers accessor initialization behavior across the helper classes, including the CosmosClientBuilder accessor path and the bulk execution thresholds accessor path.

The tests check lazy getter initialization after cached accessor state is cleared, and that a second setter call does not replace an accessor that was already installed. Line coverage for ImplementationBridgeHelpers increases by 31%.

I hope you find these tests useful. 😄 Please let me know if you have any questions or concerns.

Thanks,

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Thank you for your contribution @amirdeljouyi! We will review the pull request and get back to you soon.

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Pull request overview

This PR extends ImplementationBridgeHelpersTest with additional unit coverage for ImplementationBridgeHelpers accessor behavior, specifically validating lazy accessor initialization via accessor getters and ensuring accessor setters are idempotent (don’t replace an already-installed accessor).

Changes:

• Refactors repeated "Helper"/getDeclaredClasses() usage into shared constants.
• Adds a unit test that iterates helper classes and invokes accessor getters after clearing cached accessor state.
• Adds a unit test that verifies calling accessor setters twice does not replace the initially installed accessor.