fix: resolve MaxListenersExceededWarning on prompt calls

[shazron]

Summary

• Bumps process.stdout/process.stderr max listeners to 20 in prompt.js to prevent the MaxListenersExceededWarning that fires when @inquirer/core pipes a MuteStream to stdout in an oclif environment that already saturates the default 10-listener budget
• Adds a promptConfirm helper wrapping @inquirer/prompts confirm so callers get a proper (Y/n) UI
• Switches config:clear from a raw text input (with manual [yN] parsing) to promptConfirm

Test plan

• aio config clear — should show a (Y/n) confirm prompt with no MaxListenersExceededWarning in output
• NODE_OPTIONS="--trace-warnings" aio config clear — warning should no longer appear
• Answer n / Enter → command exits without clearing
• Answer y → config is cleared
• aio config clear -f — skips prompt entirely (no regression)
• aio config set key -i — text input prompt still works normally

🤖 Generated with Claude Code

[shazron]

The only annoying thing is, after clearing config, you might get a telemetry prompt when you try to get a key -- but that is existing behavior:

❯ aio config clear -f
❯ aio config get key

      How you use @adobe/aio-cli provides us with important data that we can use
      to make our products better. Please read our guide for more information on
      the data we anonymously collect, and how we use it.
      https://developer.adobe.com/app-builder/docs/guides/telemetry/

? Would you like to allow @adobe/aio-cli to collect anonymous usage data? Yes
Telemetry is on! Nice, you are helping us improve @adobe/aio-cli
If you would like to turn telemetry off, simply run `aio telemetry off

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

🤖 PR Reviewer

The refactor cleanly replaces a raw text prompt with a typed boolean confirm prompt, improving UX and simplifying the calling code. The workaround for MaxListenersExceededWarning is pragmatic and well-documented. Tests are thorough and correctly updated.

✅ LGTM! This PR looks good to merge.

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