Update release-related templates for the new changelogerator output format (#6702)

* update templates to upcoming context.json format

* fix merging error

* more fixes

* fix templates

* fix

* print "changelogerator --version"

* print changelogerator version as debug

* remove excluded debug info

* WIP

* Switch to changelogerator v0.10.1

* Update bundle deps

* fix

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Co-authored-by: Wilfried Kopp <[email protected]>