Fixes API To Only Return Canonical Blocks #11221
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What type of PR is this?
Bug Fix
What does this PR do? Why is it needed?
If we only have a single block of a particular slot saved in our database, we skip our canonical check. This allows non-canonical blocks to be returned from our API endpoint. This PR patches the problem by performing canonical checks on all blocks retrieved from our database. This also adds in some regression test cases for this particular instance.
Which issues(s) does this PR fix?
Fixes #11218
Other notes for review