Add packageFile prefix to renovate branches [RHELDST-36551] (#145)

Adds the package file name as a prefix to renovate branches, to have seperate "Update all dependencies" branches/PRs for each python version. The current requirement conflicts are caused because renovate updates all dependencies in the same branch to the same version. By allowing different branches for the each package file, the dependency updates should match the python versions.

Author: mbooz-rh

renovate.json

@@ -3,6 +3,7 @@
     "extends": [
       "config:best-practices", "group:all", ":enableVulnerabilityAlerts"
     ],
+    "additionalBranchPrefix": "{{packageFile}}-",
     "pip_requirements": {
       "enabled": false
     },