[RelEng] Create and update maintenance branches in release preparation #3261
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In the release preparation pipeline create the R4_XX_maintenance branch for the
eclipse.platform.releng.aggregatorrepo and all submodules. Furthermore create the commit for the maintenance branch in the aggregator repo to move the maintained release's I-build to that maintenance branch and push it as PR against the maintenance branch.This automates changes like
and allows to delete the
Create Maintenance Branchjob and its unused back-up ep-createMaintenanceBranch from the RelEng Jenkins instance.