Backport of ci: fix Envoy int test versions into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #20964 to be assessed for backporting due to the inclusion of the label backport/1.15.

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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:
@zalimeni
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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Follow-up to #20956

Nightly files do not require backport bc these only run on main, but backporting to update the test-integrations compatibility test env var.

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Overview of commits

• df1aeb8

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

Auto approved Consul Bot automated PR

[hashicorp-cla-app]

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