Backport of chore: bump upgrade integrations tests to 1.15, 116 [NET-4743] into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #18130 to be assessed for backporting due to the inclusion of the label backport/1.15.

🚨

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:
@nfi-hashicorp
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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1.15 and 1.16 are current. 1.14 is not

Sidequest: apparently we don't use the mirror any more

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Overview of commits

• 268160d - a74dba0 - b65e9c9 - 6f1ac9f - a96d90e

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

Auto approved Consul Bot automated PR

[nfi-hashicorp]

@huikang I'm not actually sure if it makes sense to backport this change or not? WDYT?

[huikang]

I think this should still be 1.14 and 1.15, since we test upgrading from previous minor versions and patch versions.