[Switch] - Invalid state issues

[SisIvanova]

The invalid state of the switch component needs some color fixes.
The design should be the same as when it is not invalid but should use the invalid state properties from the schemas.
The issue is reproducible in the Bootstrap theme - dark and light variants.

[SisIvanova]

After discussion, we decided to get rid of all invalid state properties since there is not much sense in keeping so many properties for a functionality that will almost never be used.
However, if a user wants to update the colors when the switch is invalid, he can do it as follows:

.igx-switch--invalid {
    --label-color: var(--ig-error-400);
    --label-hover-color: var(--ig-error-700);
    --border-color: var(--ig-error-400);
    --border-hover-color: var(--ig-error-700);
    --thumb-off-color: var(--ig-error-400);
}