This patch adds an amphora delete API. It can be used to delete
extra "spare" amphora after the feature has been disabled.
A followup patch will be required for the amphorav2 path as the
amphorav2 failover patch, which is required for the amphora delete
flow, has not yet merged.
Story: 2008014
Task: 40666
Change-Id: I32b6561c78c153a4b7e73b1a4b83e045fbe97fb6
