T8764: allow non-org-member chat + expand bot ignore list

Two changes against the org-wide CodeRabbit baseline, motivated by
fleet-wide noise from bot-authored PRs and chat lockouts on the public
side:

1. `chat.allow_non_org_members: false` → `true`. The `vyos` org is
   public-facing OSS; external contributors routinely open PRs and the
   previous setting blocked them from using `@coderabbitai` commands on
   their own PRs. This does not change auto-review eligibility — review
   skip rules remain governed by `reviews.auto_review`.

2. `reviews.auto_review.ignore_usernames` extended from `[mergify[bot]]`
   to the full bot list of `mergify`, `mergify[bot]`, `netlify`,
   `netlify[bot]`, `claude`, `claude[bot]`. Both the bare login and the
   `[bot]` suffix are listed because GitHub Apps use the `[bot]` form
   while service or human accounts may share the bare name; exact-match
   semantics per the schema mean listing both is required to cover
   every variant.

Net effect on per-repo `.coderabbit.yaml` files: a per-repo override that
listed the same bots becomes redundant after this merges. Repos that
need to chat-restrict (e.g. private commercial repos) can still set
`chat.allow_non_org_members: false` at the repo level since
inheritance is per-field.

Advances: IS-430

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