SYNC-5167: Errors only dashboards

[bendk]

My hope for the sync dashboard was that it could combine errors + sync metrics + other glean metrics. However, the latter 2 parts are performing poorly and we are currently only collecting metrics on Android. This updates the SYNC dashboard to only show the things that are actually working: Android errors.

The resulting dashboard is pretty functional, although somewhat bare: https://yardstick.mozilla.org/d/sync-main/sync

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
    • There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved
• Quality: This PR builds and tests run cleanly
  • Note:
    • For changes that need extra cross-platform testing, consider adding [ci full] to the PR title.
    • If this pull request includes a breaking change, consider cutting a new release after merging.
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due diligence applied in selecting them.