fix: Support mutable and immutable attributes in selectPlacement

[Mansi-mParticle]

Instructions

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Summary

• Previously, selectPlacement assumed attributes were always mutable. When an immutable map was passed, it caused issues if modifications were required during processing.Created a shallow copy of attributes before passing it to execute.This ensures compatibility with both immutable and mutable inputs.

Testing Plan

• Was this tested locally? If not, explain why.
• Tested with sample app for both immutable and mutable inputs.

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

• Closes https://go.mparticle.com/work/REPLACEME

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mparticle-automation]

🎉 This PR is included in version 5.73.2 🎉

The release is available on GitHub release

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