fix: use a spinner instead of dots while waiting for framework port

[danez]

Summary

The dots that were introduced in #4683 do mix with the output of the framework command. Instead, even for UX, I think it is better to use a spinner in this case, and some magic code to ensure it stays at the bottom as long as we wait (see gif). What do you think about that?

This also fixes the flaky tests (#4720) because the spinner is not active in non-interactive shells.

Fixes #4720

Before:

After:

[github-actions]

📊 Benchmark results

Comparing with 85db12b

Package size: 221 MB

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Legend

• T-30 (85db12b): 221 MB
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• T-10 (b9e41ec): 226 MB
• T-9 (2c58d10): 226 MB
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• T-3 (3a79895): 226 MB
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• T-1 (fd355b1): 221 MB
• T (current commit): 221 MB

[eduardoboucas]

Love it!