chore(tests): flip tsconfig.test.json noImplicitAny to true

[oliverlaz]

Follow-up to #3562.

Context

PR #3562 migrated the test suite to TypeScript and got yarn test:typecheck to 0 errors with noImplicitAny: false in package/tsconfig.test.json. Flipping it to true exposes ~630 additional errors, all mechanical annotations on:

• Destructured parameters in test helpers (e.g. renderComponent({ client, channel, props })).
• Untyped let variables at describe scope (e.g. let chatClient without an annotation).
• jest.fn() callback bodies.

All errors are in test files (plus one: src/components/Message/MessageItemView/utils/renderText.tsx where the untyped react-native-markdown-package import is currently handled via @ts-ignore).

Scope

• Flip noImplicitAny: true in package/tsconfig.test.json (remove the TODO comment).
• Annotate the ~630 implicit-any call sites. Conventions to follow (same as PR refactor(tests): migrate test suite and mock-builders to TypeScript #3562):
  • Prefer SDK types from stream-chat (StreamChat, Channel, LocalMessage, MessageResponse, UserResponse, ChannelMemberResponse, etc.).
  • Use ComponentProps<typeof X> for render-helper prop args.
  • Avoid any and as any. as unknown as T is acceptable where SDK type narrowing isn't possible.
• Keep yarn test:typecheck at 0 errors.

Out of scope (separate follow-ups)

• package/src/store/apis/upsertDraft.ts:55 — queries.concat(query) is a no-op; should be queries.push(...query).
• MessageStatus.test.tsx — it.each('string', fn) was malformed; currently it.skip. Un-skip and rewrite as proper assertions.

Acceptance

• yarn test:typecheck passes with noImplicitAny: true.
• yarn test:unit suite unchanged (same pre-existing SQLite-isolation flake, no new regressions).
• yarn build and yarn lint unchanged.