T8764: lift Org-UI Web dashboard settings into central baseline

Moves every CodeRabbit setting currently configured in the `vyos`-org
Web UI dashboard ("Organization UI Settings", precedence #5) into the
Central YAML (precedence #3) so the file is the single source of truth
for review behavior in the `vyos` org. Once this lands, the Org-UI YAML
editor can be cleared and behavior will be unchanged.

Why this matters: precedence rules state that Central YAML overrides
Organization UI per-field. Today they happen to agree, but any future
edit to the Web UI silently drifts from the file. Consolidating into
YAML makes drift a code-review-visible event.

Lifted fields:

* Top-level:
    - `early_access: false` -> `true` (matches Web UI explicit value)
* `reviews:`
    - `high_level_summary_in_walkthrough: true`
    - `review_details: true`
    - `fail_commit_status: true`
    - `estimate_code_review_effort: false`
    - `in_progress_fortune: false`
* `reviews.auto_review:`
    - `auto_pause_after_reviewed_commits: 0`
* `reviews.finishing_touches:`
    - `unit_tests.enabled: true` -> `false` (matches Web UI intent; per-
      repo overrides re-enable where appropriate — testing stacks differ
      enough that fleet-wide unit-test generation is too noisy)
    - `simplify.enabled: true`
* `reviews.tools:` disabled-linter list for stacks not in our fleet
    (swiftlint, detekt, rubocop, regal, pmd, circleci, shopifyThemeCheck,
    brakeman, blinter, smartyLint, emberTemplateLint)
* `chat:`
    - `allow_non_org_members: false`
    - `integrations.{jira,linear}.usage: disabled`
* `knowledge_base:`
    - `{jira,linear}.usage: disabled`
    - `mcp.usage: enabled`
    - `linked_repositories: ansible/ansible` — cross-repo context for the
      `vyos.vyos` Ansible Galaxy collection. vyos-org specific.

After this PR merges:
- Clear the Org-UI YAML editor in the CodeRabbit dashboard for the
  `vyos` org (paste back the empty schema-comment line). The Central
  YAML now expresses everything that was there.
- Sibling change for VyOS-Networks org on its own coderabbit central
  repo (omits `linked_repositories` per org-specific scope; keeps
  `early_access: false` since VyOS-Networks Org-UI did not set it).

🤖 Generated by [robots](https://vyos.io)

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