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closes: #7888
Description
Since #8058 it's been enabled in CI. (#8061 will consolidate the two jobs into one, but that's outside the scope of this issue).
This PR enables it outside CI too (so that it always has type info and always warns on floating promisees).
Then it upgrades the warn to an error and suppresses the rule in all files that don't yet comply. It's separate work to resolve all of those: #6000.
Security Considerations
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Scaling Considerations
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Documentation Considerations
Notify developers of the new error and that their IDE and local lint output will no emit warnings.
Testing Considerations
CI
Upgrade Considerations
n/a