Update 8.7 branch Jenkins file to publish 8.7.x line Endpoint packages

[kevinlog]

Change Summary

This updates the Jenkins file for the 8.7 branch to publish new packages on the 8.7.x line. It should publish any incremented 8.6.x packages merged to the 8.7 branch.

[elasticmachine]

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• Start Time: 2023-02-24T21:42:35.767+0000

• Duration: 8 min 37 sec

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