[a11y] Issue 13: Group/statement select buttons lack tablist role (Participation Page)

[NewJerseyStyle]

Description:

The group and statement selection buttons on the participation page should have the tablist role to ensure keyboard navigability. Currently, they are not properly structured for keyboard users.

Steps to Reproduce:

1. Navigate to the participation page (e.g. https://pol.is/4cvkai2ctw)
2. Attempt to navigate the button groups using only the keyboard.

Expected Behavior:

The button groups should be keyboard navigable.

Actual Behavior:

The button groups are not properly structured for keyboard navigation.

Component/Area: Participation page

Source: Other

Affected Elements: button groups