Prefix the release version in build-e2e with release-

[rak-phillip]

Summary

This updates the prefix for the release version in build-e2e with release-.

Occurred changes and/or fixed issues

• Prefix the release version in build-e2e with release-

Technical notes summary

The releases for Rancher UI are published to the CDN with a release-2.12 version instead of 2.12. For example, https://releases.rancher.com/ui/release-2.12/index.html.

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
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