[query] Move is.hail.check to test code

[ehigham]

Change Description

Fixes #<issue_number> (delete if N/A)

Brief description and justification of what this PR is doing.

Security Assessment

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• This change has a high security impact
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• This change has a medium security impact
• This change has a low security impact
• This change has no security impact

Impact Description

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• Example: "Docs only", "Low-level refactoring of non-security code", etc.
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• Example: "New UI text field added in analogy to existing elements, with input strings escaped and validated against code injection"

(Reviewers: please confirm the security impact before approving)

[ehigham]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [query] Move is.hail.check to test code #14801 : 2 dependent PRs (#14693 , #14698 ) 👈 (View in Graphite)
• [query] Move LoweredTableReaderCoercer into ExecuteContext #14696
• [query] Remove persistedIr from Backend interface #14692
• [query] Remove lookupOrCompileCachedFunction from Backend interface #14691
• [query] Remove BlockMatrix persist from Backend interface #14690
• [query] Expose references via ExecuteContext #14686
• [query] Extract Backend Methods called from Python into Py4JBackendExtensions #14767
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