[BUG] Fix obsolete snapshots for test within data source management p…

…lugin (#6185) (#6266)

* remove obsolete snapshots

Signed-off-by: Lu Yu <nluyu@amazon.com>

* add change log

Signed-off-by: Lu Yu <nluyu@amazon.com>

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Signed-off-by: Lu Yu <nluyu@amazon.com>
(cherry picked from commit a9e874f)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

# Conflicts:
#	CHANGELOG.md

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>