feat(api): revert preview tests that was deleted

[djabarovgeorge]

What changed? Why was the change needed?

we had this task https://github.com/novuhq/novu/pull/7137/files where we added payload variable extraction for framework workflows and fixed preview-related issues.

As part of this PR, we removed some tests related to these issues.
In this PR I reverted the tests that were deleted from generate.preview.e2e.ts and moved them to workflow.controller.e2e.ts, where the issue with the response return exists.

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[djabarovgeorge]

This is not a suggestion; in this comment, I want to highlight current potential issues we are facing.

Currently, the code is extracting and building the payload schema (used for validation and sanitation in PrepareAndValidateContentUsecase) based on the new variable extraction powered by LiquidJS. This is important because we should rely more on LiquidJS, and this is a good example of why.

In the code below, my suggestion is an old test we had that used an invalid filter not supported by LiquidJS, leading to false positive test results.

Suggested change

	body: 'This is a legal placeholder with a pipe [{{payload.variableName | upcase}}the pipe should show in the preview]',
	},
	};
	const previewResponseDto = await generatePreview(
	workflowsClient,
	workflowId,
	stepDatabaseId,
	requestDto,
	'email'
	);
	expect(previewResponseDto.result!.preview).to.exist;
	if (previewResponseDto.result!.type !== 'sms') {
	throw new Error('Expected sms');
	}
	expect(previewResponseDto.result!.preview.body).to.contain('{{PAYLOAD.VARIABLENAME | UPCASE}}');
	expect(previewResponseDto.previewPayloadExample).to.exist;
	expect(previewResponseDto?.previewPayloadExample?.payload?.variableName).to.equal(
	'{{payload.variableName | upcase}}'
	);
	body: 'This is a legal placeholder with a pipe [{{payload.variableName | upper}}the pipe should show in the preview]',
	},
	};
	const previewResponseDto = await generatePreview(
	workflowsClient,
	workflowId,
	stepDatabaseId,
	requestDto,
	'email'
	);
	expect(previewResponseDto.result!.preview).to.exist;
	if (previewResponseDto.result!.type !== 'sms') {
	throw new Error('Expected sms');
	}
	expect(previewResponseDto.result!.preview.body).to.contain('{{payload.variableName | upper}}');
	expect(previewResponseDto.previewPayloadExample).to.exist;
	expect(previewResponseDto?.previewPayloadExample?.payload?.variableName).to.equal(
	'{{payload.variableName | upper}}'
	);