[NET-11297] Purge on disable

[jm96441n]

Changes proposed in this PR

• add new field to the helm chart to allow users to purge services from consul when catalog sync is disabled, users will have to opt into this to preserve existing behavior

How I've tested this PR

How I expect reviewers to test this PR

Checklist

• [X] Tests added
• [ ] CHANGELOG entry added

[jm96441n]

bats tests added with commit https://github.com/hashicorp/consul-k8s/pull/4378/commits/6a2b63d5114f2ffe1d7166e6c68a149ed6bb370b