fix(jsx): add the CSP nonce to all scripts generated by ErrorBoundary - #5430

#4216 added scriptNonce support via StreamingContext, but two of the three inline scripts ErrorBoundary emits while streaming were left without the nonce:

• the script that swaps in the fallback when a child rejects during streaming
• the cleanup script emitted after all nested Suspense boundaries resolve

Under a nonce-based CSP these scripts are blocked, so the fallback is never shown and the boundary markers are never removed.

renderToReadableStream(
  <StreamingContext value={{ scriptNonce: 'n0nce' }}>
    <ErrorBoundary fallback={<p>error</p>}>
      <Suspense fallback={<p>Loading...</p>}>
        <AsyncComponentThatThrows />
      </Suspense>
    </ErrorBoundary>
  </StreamingContext>
)
// before: the fallback is emitted with a plain `<script>`
// after:  `<script nonce="n0nce">`

The existing "with StreamingContext" test was asserting the nonce-less cleanup script; it now expects the nonce, and a test for the error path is added. Both tests fail without this change.

Related: #4205, #4216.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code