Backport of [NET-11297] Purge on disable into release/1.6.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #4378 to be assessed for backporting due to the inclusion of the label backport/1.6.x.

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Warning automatic cherry-pick of commits failed. If the first commit failed,
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The person who merged in the original PR is:
@jm96441n
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/consul-k8s/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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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

• Tests added
• CHANGELOG entry added

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Overview of commits

• 2cc3fe3 - ca3df7c - 0ecfe35 - b667860 - 0fd8e01 - 9f491d4 - b1f29a1 - bde9f05 - 681eee1 - 8dd18f4 - 6a2b63d

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