Update focus outline for v3 components

[rsmithadhoc]

Description

Some components use the default browser focus outline instead of the yellow VA outline. Others have miscellaneous issues, detailed below.

• Add yellow focus outline:
  • Breadcrumbs
  • Form - Privacy Agreement - privacy link
  • Form - Statement of Truth - privacy link
• Banner - Promo
  • Currently outlines the banner itself with the yellow outline, then the internal elements with the default browser outline.
  • Instead, we should remove the outline from the banner itself as it is not an interactive element, then apply the yellow outline to the link and button inside the banner.
• Back to Top - Remove transition animation to keep it consistent with other components.

Tasks

• [ ] Update each component's focus outline.

Acceptance Criteria

• [ ] VA outline appears as intended on the components mentioned.

[caw310]

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