Add warning banner for download table preview for entities with lots of vars

[asizemore]

Resolves #1652

Current behavior

Now it looks like:

That error banner only comes up once i've clicked at least one var.

Is it weird to have both banners? I thought about removing the server-error banner, but i dont want to hide errors that might be useful to us to see later...

[dmfalke]

I think we want to avoid making the request if showPreviewTableWarning === true.

I would rename that variable to something like canLoadTablePreview and define it closer to the top of the component, and use that value as a part of this condition.

[dmfalke]

I would rename that variable to something like canLoadTablePreview and define it closer to the top of the component, and use that value as a part of this condition.

Hmm... maybe this would be a better place to add the check.

[asizemore]

Thanks @dmfalke !
Now after the update it looks like:

[dmfalke]

Once my comment is addressed, I think this is ready to go!

[dmfalke]

canLoadTablePreview should probably be added to the list of dependencies for this callback function (

web-eda/src/lib/workspace/Subsetting/SubsetDownloadModal.tsx

Lines 280 to 287 in f606310

	[
	selectedVariableDescriptors,
	studyMetadata.id,
	subsettingClient,
	analysisState.analysis?.descriptor.subset.descriptor,
	currentEntity,
	mergeKeys,
	]

)

[asizemore]

Right, because if this value changed we'd definitely want to stop/start fetching data. Thank you!