[build] migrate build dep from community to intellijIdea

[pq]

Community appears to be gone. Long live, intellijIdea.

This gets the build working for me locally but I'll have to defer to you all as to whether this is something we want to land.

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• See our [contributor guide](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md for general expectations for PRs.
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[pq]

This should unblock #210 and hopefully #223

[pq]

After another restart, the verifiers ran green. 🎉