feat: adds alt prop for accessibility

[anechol]

Description

Adds alt prop for accessibility purposes.

Since this component has a role of img, an aria-label or equivalent is required to serve as the primary alternative text. Adding an alt prop option helps improve a11y by providing additional information in cases where the icon does not render in the browser.

Icon docs will updated in a separate PR for the Pine repo.

DSS-1386

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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• unit tests
• e2e tests
• accessibility tests
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Test Configuration:

• Pine versions:
• OS:
• Browsers:
• Screen readers:
• Misc:

Checklist:

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• My code follows the style guidelines of this project
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• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Design has QA'ed and approved this PR

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[pixelflips]

Have we considered using aria-hidden="true" instead of alt="" and role="img"? Since we typically use them as just decorative icons, it might avoid sending mixed signals to screen readers.

I briefly tried to find any usage of standalone icons (outside of button, link, etc), but haven't so far. Just an additional thought, and I may not fully be understanding the problem with the image role and the aria-label.

[anechol]

This can be an option, yes. There's different avenues we can pursue for this. I added a quick meeting on the books to discuss the broader aspect of accessibility in Pine with our inherited attributes utility.