Revert "Relase/676.0.0 (#7142)"

[Prithpal-Sooriya]

This reverts commit 9b84201.

Explanation

This release used an invalid commit name (Relase/676.0.0) so the publish CI script did not run.
Reverting and will add this back as a fast follow.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

---

Note

Rolls back release versions (core to 675.0.0, shield-controller to 2.0.0) and updates shield-controller changelog accordingly.

• Versions:
  • Roll back root package.json from 676.0.0 to 675.0.0.
  • Roll back packages/shield-controller/package.json from 2.1.0 to 2.0.0.
• Changelog (packages/shield-controller/CHANGELOG.md):
  • Remove 2.1.0 section; keep its entry under Unreleased.
  • Update compare links to reference 2.0.0 and drop 2.1.0 link.

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