[eas-cli] metadata:pull: print --non-interactive hint before overwrite prompt

[Maples7]

Why

The overwrite confirmation in eas metadata:pull is unanswerable in a number of common environments and indistinguishable from a hang:

• Inside an AI-agent integrated terminal (Copilot Chat, etc.) that wraps the shell in a pty: process.stdin.isTTY === true, so EASNonInteractiveFlag's autodetect doesn't trigger, and there is no human to type y.
• When stdout is piped (eas metadata:pull | tee log): the prompt is often hidden behind the spinner/pipe.
• Inside nohup without < /dev/null.

The fix in #3691 is split into three suggestions; this PR ships the smallest one (suggestion 2) — print an explicit hint immediately before the confirm — because it's a pure log addition with no behavioral change to the default flag autodetect. The other two suggestions in the issue (auto-non-interactive when !process.stdout.isTTY, default-overwrite for matching appId) are larger UX/behavior changes and are best discussed in the issue thread before being merged.

Refs #3691. Closes #3691.

How

Add one Log.log(chalk.dim('Tip: pass --non-interactive to auto-overwrite ... without prompting.')) line in downloadMetadataAsync immediately before confirmAsync. Stays inside the else branch so it does not print under --non-interactive. Uses chalk.dim to match the muted style of other hint lines in the codebase.

Test Plan

Added two unit tests in packages/eas-cli/src/metadata/__tests__/download.test.ts:

$ yarn test src/metadata/__tests__/download.test.ts
PASS src/metadata/__tests__/download.test.ts
  downloadMetadataAsync
    ✓ skips overwrite prompt and auto-overwrites in non-interactive mode
    ✓ prompts for overwrite in interactive mode when file exists
    ✓ prints a --non-interactive hint before the overwrite prompt so a stuck invocation is self-explanatory
    ✓ does not print the --non-interactive hint when running in non-interactive mode
    ✓ throws MetadataValidationError when user declines overwrite in interactive mode
    ✓ does not prompt when file does not exist
Test Suites: 1 passed, 1 total
Tests:       6 passed, 6 total

Full metadata suite still passes (yarn test src/metadata → 15 suites, 189 tests, 187 baseline + 2 new). yarn typecheck clean. yarn lint clean (0 errors; pre-existing warning count unchanged).

Manual smoke test (against my own ASC project):

$ eas metadata:pull --profile production
✔ Linked to project @<owner>/<project>
EAS Metadata is in beta and subject to breaking changes.
Tip: pass --non-interactive to auto-overwrite "store.config.json" without prompting.
✔ Do you want to overwrite the existing "store.config.json"? … yes
Downloading App Store config...
🎉 Your store config is ready.

/changelog-entry chore [eas-cli] Print a --non-interactive hint before the metadata:pull overwrite prompt so stuck invocations under piped stdout / agent terminals are self-explanatory.

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