Rename inherited keda changelog entries to this PR's number

This branch is based on the not-yet-merged vwhitchurch/keda-discovery
branch, so its own changelog.d entries (numbered for PR #24459) show up
in this PR's diff against master. CI's changelog check requires any
non-deleted changelog.d entry in the diff to bear the current PR's
number, so rename them to #24507 here; they will be superseded once
#24459 merges and this branch is rebased onto master.

Environment: Datadog workspace

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: vitkyrka