fix(core): compile field-label only once

[josokinas]

Purpose

Following #293 main compilation of all components is wrong, as conditional inclusion uses includes for keeping a map of what has been included.

Approach

Rollback to checking for whether "field-label" was already included.

Another option is to exclude this component from a list of all components completely, however then we might introduce a bug when "field-label" is removed from both "input" and "textarea".

Testing

Tested local build.

Risks

N/A

[github-actions]

🎊 PR Preview 4b4bb46 has been successfully built and deployed to https://onfido-castor-preview-pr-298.surge.sh

🕐 Build time: 109.234s

_{🤖 By surge-preview}

[rabelloo]

Right, we forgot about this.
Unless we check whether or not it has been included, it won't be set.

Yet another option is doing something like

@mixin FieldLabel() {
  includes.the('field-label');
}

Which means it marks itself as included when called.

But I'm happy with the current.

[josokinas]

Which means it marks itself as included when called.

That's actually a good suggestion.

Maybe each component by default could mark itself included.

Let's see later if we have another situation of such, then we can implement something a little more smart.