fix: added missing user type in TeamJoinEvent

[be320]

Summary

I fixed the missing User type that should be added in teamJoin event Handler and it was already a TODO task in your code. I have created an issue for it, and there is the issue link : #1889

Requirements (place an x in each [ ])

• [x ] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x ] I've read and agree to the Code of Conduct.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @be320 to sign the Salesforce Inc. Contributor License Agreement.

[seratch]

LGTM

[codecov]

Codecov Report

Merging #1890 (e3e2eca) into main (6dc7fc9) will not change coverage.
The diff coverage is n/a.

❗ Current head e3e2eca differs from pull request most recent head 0714163. Consider uploading reports for the commit 0714163 to get more accurate results

@@           Coverage Diff           @@
##             main    #1890   +/-   ##
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  Coverage   82.18%   82.18%           
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  Files          18       18           
  Lines        1521     1521           
  Branches      436      436           
=======================================
  Hits         1250     1250           
  Misses        175      175           
  Partials       96       96           

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