fix(import): correctly identify a default exported component

[liady]

Problem:
Today we don't recognize when a default export is declared separately.

function App(){...}
export default App

this is not treated as a component when it's imported:

Monosnap.screencast.2024-10-02.14-48-14.mp4

Fix:
Use isExportDefault instead of a specific check for a function or a class

Manual Tests:
I hereby swear that:

• I opened a hydrogen project and it loaded
• I could navigate to various routes in Play mode

Fixes #6439

[github-actions]

Try me

[relativeci]

#14615 Bundle Size — 57.76MiB (~-0.01%).

9467373(current) vs 916e8b9 master#14614(baseline)

Warning

Bundle contains 70 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 improvement

	Current #14615	Baseline #14614
Initial JS	40.76MiB(~-0.01%)	40.76MiB
Initial CSS	0B	0B
Cache Invalidation	18.49%	38.03%
Chunks	21	21
Assets	23	23
Modules	4112	4112
Duplicate Modules	213	213
Duplicate Code	27.4%	27.4%
Packages	475	475
Duplicate Packages	70	70

Bundle size by type   2 changes 2 improvements

	Current #14615	Baseline #14614
JS	57.75MiB (~-0.01%)	57.75MiB
HTML	7.37KiB (-0.25%)	7.39KiB

Bundle analysis report Branch fix/default-export-comp Project dashboard

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