feat: add label text-align property to field base styles

[vursen]

Description

Follow-up to #12590

• Added --vaadin-input-field-label-text-align to the shared field styles. It sets text-align on the label part and falls back to inherit, so the default look is unchanged.
  • In the label-aside variant it only has a visible effect when --vaadin-input-field-label-aside-width is wider than the label text, since the label column is sized to the label by default.
• Reset text-align on checkbox, radio button and switch labels so the property does not move their label away from the control.
• Listed the property in the JSDoc of every field component.
• Added a custom label text align visual test to field-base.test.js for the label-aside variant with a wrapping label, in LTR and RTL.

Type of change

• Feature

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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