fix(input): do not float label because of slotted items

[ErikOnBike]

Issue number: resolves #28665

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What is the current behavior?

The input label is floating if an element is slotted. This is especially annoying if a password toggle is present, since it will start floating the label (even when no input is available).

What is the new behavior?

A label will only float (if specified and) if it has a value or received focus.

Does this introduce a breaking change?

• [ ] Yes
• [X] No

Other information

Screenshot before:

Screenshot after:

This issue also seems to fix issue #29449