Disable Lift export when Frontier is empty

[andracc]

Resolves #3441

This change is 

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Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.64%. Comparing base (7f23e66) to head (ca8b1d6).

Files with missing lines	Patch %	Lines
src/components/ProjectExport/ExportButton.tsx	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3440      +/-   ##
==========================================
+ Coverage   74.58%   74.64%   +0.05%     
==========================================
  Files         285      285              
  Lines       10999    11003       +4     
  Branches     1339     1339              
==========================================
+ Hits         8204     8213       +9     
+ Misses       2410     2405       -5     
  Partials      385      385              

Flag	Coverage Δ
backend	83.62% <ø> (+0.07%)	⬆️
frontend	66.66% <62.50%> (+0.04%)	⬆️

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[imnasnainaec]

Reviewed 1 of 2 files at r2, all commit messages.
Reviewable status: 1 of 2 files reviewed, 3 unresolved discussions (waiting on @andracc)

---

src/components/ProjectExport/ExportButton.tsx line 16 at r2 (raw file):

  projectId: string;
  buttonProps?: ButtonProps & { "data-testid"?: string };
  disabled?: boolean;

It looks like this new optional prop isn't been used.

---

src/components/ProjectExport/ExportButton.tsx line 22 at r2 (raw file):

export default function ExportButton(props: ExportButtonProps): ReactElement {
  const dispatch = useAppDispatch();
  const [exports, setExports] = useState<boolean>(false);

The <boolean> can be dropped, since the type is implied from the default value.

---

src/components/ProjectExport/ExportButton.tsx line 43 at r2 (raw file):

          setExports(true);
        }
      });

Because setExports is a function that takes a boolean, you should be able to condense this to

await isFrontierNonempty(props.propjectId).then(setExports);

(There's no performance concern for updating a state to what it already is, because rerenders are only triggered when states and props change.)

---

src/components/ProjectExport/ExportButton.tsx line 53 at r2 (raw file):

        <LoadingButton
          loading={loading}
          disabled={loading}

Since the LoadingButton has a disabled prop, probably better to update that with loading || !exports than to conflict with it via the buttonProps.