chore: release 2.8.0

[mparticle-automation]

Release 2.8.0

These files should have changed during the release, if they didn't then this is likely an issue and should be investigated:

• VERSION
• README.md
• CHANGELOG.md

[cursor]

PR Summary

Low Risk
Documentation and version metadata only; no runtime or API code changes in this diff.

Overview
Cuts 2.8.0 by updating VERSION, Gradle/Maven examples in README.md, and CHANGELOG.md.

The changelog adds a dated 2.8.0 section (Samsung TV platform and Tizen Advertising ID) and refreshes compare links so Unreleased points at 2.8.0...HEAD.

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