[1.16.x] Vault CA provider clean up previous default issuers (#18773)#18784

kisunji merged 3 commits intorelease/1.16.xhashicorp/consul:release/1.16.xfrom

backport/1.16.x-vault-ca-clean-unused-issuershashicorp/consul:backport/1.16.x-vault-ca-clean-unused-issuersCopy head branch name to clipboard