fix(docs): button a11y enhancements (#49952)

## What kind of change does this PR introduce?

bug fix for accessibility, fixes
[docs-1265](https://linear.app/supabase/issue/DOCS-1365/add-aria-label-to-icon-only-buttons-button-name)

## What is the current behavior?

some controles in the docs app have no accessible name, so screen
readers announce them as an unlabelled "button"

## What is the new behavior?

- adds each control a name the way its neighbours already do
- adds menu toggle a state-dependent `aria-label` and `aria-expanded`
- adds `button-name` to `enforced_rules`

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Accessibility**
- Added descriptive labels to configuration selectors and mobile menu
controls.
- Mobile menu controls now announce whether the menu is open or closed.
- Expanded accessibility validation to check button names across
documentation pages.

- **UI Improvements**
- Updated the raw throughput table control with a clearer button
appearance and expandable chevron indicator.
  - Replaced a schema-migration tooltip with a direct in-page link.

- **Documentation**
- Removed the Info Tooltip component guidance from the contributing
documentation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

e2e/docs/utils/axe-helpers.ts

@@ -5,7 +5,7 @@ import { scan } from '../../shared/axe.ts'
 
 export const WCAG_TAGS = ['wcag2a', 'wcag2aa', 'wcag21a', 'wcag21aa']
 
-export const ENFORCED_RULES = ['heading-order', 'page-has-heading-one']
+export const ENFORCED_RULES = ['heading-order', 'page-has-heading-one', 'button-name']
 
 export const EXCLUDED_RULES = [
   'color-contrast',
@@ -40,7 +40,7 @@ export async function scanArticle(
   include: string
 ): Promise<A11yScanResult> {
   const reported = await scan(page, { tags: WCAG_TAGS, excludeRules: EXCLUDED_RULES, include })
-  const enforced = await scan(page, { rules: ENFORCED_RULES, include })
+  const enforced = await scan(page, { rules: ENFORCED_RULES })
 
   const byRule = new Map([...reported, ...enforced].map((violation) => [violation.id, violation]))