Remove Warning: prefix and toString on console Arguments (#29839)

Basically make `console.error` and `console.warn` behave like normal -
when a component stack isn't appended. I need this because I need to be
able to print rich logs with the component stack option and to be able
to disable instrumentation completely in `console.createTask`
environments that don't need it.

Currently we can't print logs with richer objects because they're
toString:ed first. In practice, pretty much all arguments we log are
already toString:ed so it's not necessary anyway. Some might be like a
number. So it would only be a problem if some environment can't handle
proper consoles but then it's up to that environment to toString it
before logging.

The `Warning: ` prefix is historic and is both noisy and confusing. It's
mostly unnecessary since the UI surrounding `console.error` and
`console.warn` tend to have visual treatment around it anyway. However,
it's actively misleading when `console.error` gets prefixed with a
Warning that we consider an error level. There's an argument to be made
that some of our `console.error` don't make the bar for an error but
then the argument is to downgrade each of those to `console.warn` - not
to brand all our actual error logging with `Warning: `.

Apparently something needs to change in React Native before landing this
because it depends on the prefix somehow which probably doesn't make
sense already.

Author: sebmarkbage

packages/internal-test-utils/shouldIgnoreConsoleError.js

@@ -7,6 +7,9 @@ module.exports = function shouldIgnoreConsoleError(format, args) {
         args[0] != null &&
         ((typeof args[0] === 'object' &&
           typeof args[0].message === 'string' &&
+          // This specific log has the same signature as error logging.
+          // The trick is to get rid of this whole file.
+          !format.includes('Failed to serialize an action') &&
           typeof args[0].stack === 'string') ||
           (typeof args[0] === 'string' &&
             args[0].indexOf('An error occurred in ') === 0))

packages/react-cache/src/__tests__/ReactCacheOld-test.internal.js

@@ -182,7 +182,7 @@ describe('ReactCache', () => {
         await waitForAll(['App', 'Loading...']);
       }).toErrorDev([
         'Invalid key type. Expected a string, number, symbol, or ' +
-          'boolean, but instead received: Hi,100\n\n' +
+          "boolean, but instead received: [ 'Hi', 100 ]\n\n" +
           'To use non-primitive values as keys, you must pass a hash ' +
           'function as the second argument to createResource().',
       ]);