Backport of test: fix snapshot save w/ append test for ENT into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #18656 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:
@DanStough
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

Small fix for this test. This fails in ENT because the version has 1.17.0+ent, but the test agent version does not have the +ent suffix.

The original PR is #18625

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Overview of commits

• c79a47a

[hashicorp-cla]

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2 out of 3 committers have signed the CLA.

• absolutelightning
• DanStough
• temp

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

Auto approved Consul Bot automated PR