Add `home-assistant` to ecosystem projects
Summary
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I think Micha suggested this before, but I couldn't find the message. This also
may have helped to catch #23125.
Test Plan
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CI on this PR. I think this is a pretty large repo, so I want to make sure it
doesn't cause too much of a slowdown, in addition to the job passing. However,
it only takes ~4 seconds to check locally compared to ~22 for airflow, despite
containing more files (16k vs 6.5k) and more lines of code (3 million vs 1.2
million).