Backport of OSS -> CE into release/1.16.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #18517 to be assessed for backporting due to the inclusion of the label backport/1.16.

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The person who merged in the original PR is:
@analogue
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/merges: 409 Merge conflict []

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

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Description

See NET-5353 for acceptance criteria.

Most of the changes fall into two buckets:

• filename change only: variations of *_oss_*.go -> _ce_*.go
• additional file content changes: code and comment variations of OSS -> CE

Things I chose to skip are annotated with TODO(spatel): CE refactor because I'm not sure of the implications of the change and what it may break. These will be revisited as time permits.

Testing & Reproduction steps

All checks have passed.

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

Tagging team leads as primary reviewers for visibility and due to the extent of the changes.

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Overview of commits

• c902ee2 - 1e16c5e - dceaaeb - f8936c3 - 246fe35 - d44f9ca - 06a56e7

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[github-team-consul-core-pr-approver]

Auto approved Consul Bot automated PR

[analogue]

Closing. Manual backport in #18549