[Discover] remove huge fields FTR

[drewdaemon]

Summary

Part of #270754

Removes what was essentially a browser-based field pagination test.

Justification

We already test pagination at the component level. We don't need to test the browser's scroll handler.

kibana/src/platform/packages/shared/kbn-unified-field-list/src/components/field_list_grouped/field_list_grouped.test.tsx

Lines 260 to 299 in 734a035

	it('renders correctly when paginated', async () => {
	const user = userEvent.setup();
	await mountGroupedList({
	listProps: {
	...defaultProps,
	fieldsExistenceStatus: ExistenceFetchStatus.succeeded,
	},
	hookParams: {
	dataViewId: dataView.id!,
	allFields: manyFields,
	},
	});
	expect(screen.getByTestId(DESCRIPTION_ID)).toHaveTextContent(
	'25 available fields. 112 unmapped fields. 3 meta fields.'
	);
	const availableFields = screen.getByTestId('fieldListGroupedAvailableFields');
	const unmappedFields = screen.getByTestId('fieldListGroupedUnmappedFields');
	const metaFields = screen.getByTestId('fieldListGroupedMetaFields');
	expect(within(availableFields).getAllByTestId('testFieldItem')).toHaveLength(25);
	expect(within(unmappedFields).queryAllByTestId('testFieldItem')).toHaveLength(0);
	expect(within(metaFields).queryAllByTestId('testFieldItem')).toHaveLength(0);
	expect(
	screen.getByText("Fields that aren't explicitly mapped to a field data type.")
	).toBeVisible();
	await user.click(screen.getByRole('button', { name: /unmapped fields/i }));
	expect(within(availableFields).getAllByTestId('testFieldItem')).toHaveLength(25);
	expect(within(unmappedFields).getAllByTestId('testFieldItem')).toHaveLength(50);
	expect(within(metaFields).queryAllByTestId('testFieldItem')).toHaveLength(0);
	await user.click(screen.getByRole('button', { name: /meta fields/i }));
	expect(within(availableFields).getAllByTestId('testFieldItem')).toHaveLength(25);
	expect(within(unmappedFields).getAllByTestId('testFieldItem')).toHaveLength(88);
	expect(within(metaFields).queryAllByTestId('testFieldItem')).toHaveLength(0);
	});

[kibanamachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 734a035
• Build duration: 92 mins

Failed CI Steps

• FTR Configs #11
• FTR Configs #43

Test Failures

• [job] [logs] FTR Configs #43 / serverless observability UI - ML and Discover discover/observabilitySolution/context_awareness extension getRowIndicatorProvider should not render log.level row indicators for logs data source without a log.level field

Metrics [docs]

✅ unchanged