Backport of Add changelog entry for 1.16.0 into release/1.16.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #17987 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:
@nathancoleman
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.

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

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Description

Porting over the 1.16.0 changelog entry from the release/1.16.0 branch

Testing & Reproduction steps

Links

PR Checklist

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

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Overview of commits

• 4b3850a

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

Auto approved Consul Bot automated PR