Required indicator on radio-group, select, combobox, and text-area

[mollykreis]

Pull Request

🤨 Rationale

Add required-visible attributes to the radio-group, select, combobox, and text-area components as part of #2100.

There is still a need to add this attribute to the text-field and number-field. That will be done once the templates for those components have been forked (#2495).

👩‍💻 Implementation

Within the patterns directory, I created a mixin that can be used on elements that should have a requiredVisible property and required-visible attribute. Additionally, shared styling was added for the requiredVisible state and a function was created to generate the template for an element's label. This is a function rather than a constant template because each element already had an existing label structure that I didn't want to change as part of this PR.

The template of each element included in this PR was also updated to set aria-required based on the value of requiredVisible.

I also updated the styling of icons to make the svg display: block because this solved a problem I encountered when shrinking the asterisk icon down to 5x5.

🧪 Testing

• Manually tested
• New matrix tests
• Unit tests for the new mixin
• New unit tests for the ARIA behavior of each element

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[mollykreis]

@msmithNI - will you buddy this PR for me?

[fredvisser]

Looks like nodejs/node#56127 highlights the build issue we have here.