See associated pull request for more information.

If the computed's `toString` is called and `node.value` is a Symbol, the browser will throw an exception `ERROR TypeError: Cannot convert a Symbol value to a string`

Symbols cannot be implicitly changed to strings. This change changes the conversion to be explicit by wrapping `node.value` with `String()`

This can be reproduced if you create a computed with `createComputed(computation, equal)` and call `toString()` while `node.value` is something like `Symbol(UNSET)`

Updated Angular adev cross repo docs files.

This better reflects the intent to indicate an error during submission,
regardless of whether the error came from the server or not.

This commit adds a utility method to debug why the application has not stabilized after
a set period of time (9 seconds, or `hydrationTimeout-1`).

fixes #52912

See associated pull request for more information.