[DOCS] Integrates 6.x items in master changelog #30375
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This PR adds the items from the 6.x branch's CHANGELOG.asciidoc into the master file.
I believe this is the desired behaviour, since it makes it easier to backport changes to all branches.
This PR also fixes some oddities in the ordering of the releases.
Related to #29450
If the the 5.x items should also be added to the master file, this can be done after #30374 is complete.