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chore(studio): add jsx-a11y ESLint ratchet rules for statically-detectable a11y issues (#47582)

## Summary
- Follow-up to the axe-core accessibility audit (FE-3781), which found
1,733 failing elements across 126 Studio surfaces deduplicating to 12
root-cause families. A subset of those (missing accessible names/labels,
invalid/redundant ARIA, empty headings/anchors) is statically detectable
— this adds ESLint coverage for it instead of relying solely on the
runtime axe-core CI gate.
- Adds 13 `jsx-a11y` rules to `apps/studio/eslint.config.cjs` at
`'warn'`: `aria-props`, `aria-proptypes`, `role-supports-aria-props`,
`anchor-has-content`, `control-has-associated-label`
(`controlComponents: ['Button', 'Switch']`),
`label-has-associated-control` (`labelComponents: ['Label']`,
`controlComponents: ['Input', 'Switch']`), `aria-role`,
`no-redundant-roles`, `no-aria-hidden-on-focusable`,
`tabindex-no-positive`, `anchor-is-valid`, `heading-has-content`,
`no-distracting-elements`.
- Wires all 13 into the existing `lint:ratchet` script and initializes
their baselines in `apps/studio/.github/eslint-rule-baselines.json`, so
any *new* violation fails `studio-lint-ratchet.yml` while the
pre-existing ones (mostly `control-has-associated-label`: 274,
`label-has-associated-control`: 37) are tracked and shrink over time via
the weekly baseline-decrease cron.

Resolves
[FE-3795](https://linear.app/supabase/issue/FE-3795/add-jsx-a11y-eslint-ratchet-rules-for-statically-detectable-a11y).

## Test plan
- [x] `pnpm --filter studio run lint:ratchet` passes (exit 0, no
regressions)
- [x] Spot-checked several flagged instances against source to confirm
true positives (e.g. an unlabeled save/cancel icon-button pair in
`AIAssistantChatSelector.tsx`, an empty `<h3>` in `PITRForm.tsx`)
- [x] CI (`studio-lint-ratchet.yml`, typecheck.yml lint step) green on
this PR

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## Summary by CodeRabbit

* **Bug Fixes**
* ... (continued)

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