fix: Add MPID to selectPlacements call

[alexs-mparticle]

Summary

• Add mpid to selectPlacements() call

Testing Plan

• Use a sample app and verify mpid is being sent to Rokt.selectPlacements() call

[Copilot]

Pull Request Overview

This PR adds support for including the mpid value in the selectPlacements call.

• Updates the Rokt-Kit module to merge mpid from filteredUser into the attributes passed to launcher.selectPlacements.
• Adjusts and extends tests in test/src/tests.js to verify that the mpid is correctly added.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/src/tests.js	Updates and new test cases to confirm mpid is included in placement options.
src/Rokt-Kit.js	Adds retrieval of mpid from filteredUser and includes it in selectPlacements attributes.

Comments suppressed due to low confidence (2)

src/Rokt-Kit.js:33

• Ensure that 'window.mParticle.Rokt.filters.filteredUser' is reliably defined before its use to retrieve the mpid, preventing potential runtime errors if its structure changes.

self.filteredUser = window.mParticle.Rokt.filters.filteredUser;

test/src/tests.js:219

• [nitpick] Consider extracting the hardcoded mpid value '123' into a shared constant to improve clarity and ease updates across multiple tests.

                    mpid: '123',

[rmi22186]

unskip?

Suggested change

	it.skip('should filter user attributes through filterUserAttributes function before sending to selectPlacements', async () => {
	it('should filter user attributes through filterUserAttributes function before sending to selectPlacements', async () => {