Fix: Replace enableHtmlInAppMessages deprecated method with allowUserSuppliedJavascript (v3)

[jaissica12]

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Summary

• Replacing deprecated enableHtmlInAppMessages setting with new one allowUserSuppliedJavascript

Testing Plan

• Was this tested locally? If not, explain why.
• {explain how this has been tested, and what, if any, additional testing should be done}

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://go/j/SDKE-882

[Copilot]

Pull request overview

Updates the Braze (v3) web kit to use Braze’s newer initialization option for enabling user-supplied JavaScript/HTML, and hardens a Braze reserved-attribute test to avoid hard-coded years.

Changes:

• Replace the deprecated Braze init option enableHtmlInAppMessages with allowUserSuppliedJavascript in kit initialization.
• Update the $Age reserved attribute test to assert year-of-birth dynamically based on the current year.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/BrazeKit-dev.js	Switches the Braze SDK initialization option to allowUserSuppliedJavascript.
test/tests.js	Makes year-of-birth expectations derived from the current year rather than a hard-coded constant.

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