Simplify failed checks search for re-run

[ievdokdm]

Fusion checks are scheduled only if there are no engine checks needed or all engine checks are succeeded.
Therefore if several check guards exists no need to search for failed checks across all existed but only latest one may have failed checks.

Fixes: flutter/flutter#181334

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[jtmcdole]

   info - lib/model/discord_message.g.dart:18:3 - Use the null-aware marker '?' rather than a null check via an 'if'. Try using '?'. - use_null_aware_elements

[auto-submit]

autosubmit label was removed for flutter/cocoon/4925, because This PR has not met approval requirements for merging. Changes were requested by {jtmcdole}, please make the needed changes and resubmit this PR.
The PR author is a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.

• Merge guidelines: A PR needs at least one approved review if the author is already part of flutter-hackers or two member reviews if the author is not a flutter-hacker before re-applying the autosubmit label. Reviewers: If you left a comment approving, please use the "approve" review action instead.

[jtmcdole]

Constructs a DateTime with the current UTC date and time.

Neat!