fix(core): allow signal write error (angular#57973)

Now that effects allow to write to signals (see angular@4e890cc),
the SIGNAL_WRITE_FROM_ILLEGAL_CONTEXT error is only thrown in `computed` functions.
This commit updates the error message to remove the mention of effects and of the deprecated `allowSignalWrites` option.

PR Close angular#57973

Author: cexbrayat

packages/core/src/application/application_ref.ts

@@ -71,9 +71,7 @@ export function publishSignalConfiguration(): void {
   setThrowInvalidWriteToSignalError(() => {
     throw new RuntimeError(
       RuntimeErrorCode.SIGNAL_WRITE_FROM_ILLEGAL_CONTEXT,
-      ngDevMode &&
-        'Writing to signals is not allowed in a `computed` or an `effect` by default. ' +
-          'Use `allowSignalWrites` in the `CreateEffectOptions` to enable this inside effects.',
+      ngDevMode && 'Writing to signals is not allowed in a `computed`.',
     );
   });
 }