Account configs inherit channel-level fields at runtime (e.g.,
resolveTelegramAccount shallow-merges top-level and account values).
An account can set dmPolicy='allowlist' and rely on the parent's
allowFrom, so validating allowFrom on the account object alone
incorrectly rejects valid multi-account configs.
Removes requireAllowlistAllowFrom and requireOpenAllowFrom from all
account-level schemas (Telegram, Signal, IRC, iMessage, BlueBubbles).
Top-level config schemas still enforce the validation.
Addresses Codex review feedback on #27936.
Marcus Widing
0fdac31383