Revert "Refactor snapshots collector (prometheus-community#789)"

This reverts commit 3442340.

Author: jaimeyh

CHANGELOG.md

@@ -1,11 +1,3 @@
-## master / unreleased
-
-BREAKING CHANGES:
-
-The flag `--es.snapshots` has been renamed to `--collector.snapshots`.
-
-* [CHANGE] Rename --es.snapshots to --collector.snapshots #XXX
-
 ## 1.6.0 / 2023-06-22
 
 BREAKING CHANGES: