Forms: Fix loading state to prevent empty state flash

[lezama]

Summary

Improves loading state logic to show spinner immediately when data hasn't resolved yet, preventing empty state flash before data loads.

Changes

• Changed loading condition from isResolving to !rawRecords?.length && !hasResolved
• Shows loading spinner immediately if no data and not yet resolved
• Prevents jarring empty state → loading → content transition

UX Impact

• Smoother perceived performance
• No visual flash of empty state
• Loading spinner appears immediately when expected

Related

Main PR: #45339

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Code Coverage Summary

Cannot generate coverage summary while tests are failing. 🤐

Please fix the tests, or re-run the Code coverage job if it was something being flaky.

Full summary · PHP report · JS report

[edanzer]

Is there anything I need to do to see/duplicate the 'flash' issue? I'd like to confirm the issue before testing the fix, but I don't typically see a flash when the form responses page loads.