Revert "Use the 'any' constraint for the recommended dep on package:test."

This reverts commit c27af75504.

Reason for revert: There's not consensus on the `^1.0.0` vs. `any` constraint on package:test; see https://github.com/dart-lang/stagehand/pull/657 for the conversation. I'm reverting this change for now so that stagehand and dartdev are in agreement. We can update them both if we decide that `any` is a better constraint to recommand.

Original change's description:
> Use the 'any' constraint for the recommended dep on package:test.
> 
> Change-Id: I4052cf0653d827795e120b9b2beecc285935973a
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/139680
> Reviewed-by: Gary Roumanis <grouma@google.com>
> Reviewed-by: Jaime Wren <jwren@google.com>
> Reviewed-by: Michael Thomsen <mit@google.com>
> Commit-Queue: Devon Carew <devoncarew@google.com>

TBR=mit@google.com,devoncarew@google.com,jwren@google.com,grouma@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I60c09b399530f4860f59bd31535d29ca3adb70f3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/140764
Reviewed-by: Jaime Wren <jwren@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>

pkg/dartdev/lib/src/commands/test.dart

@@ -50,7 +50,7 @@ class TestCommand extends DartdevCommand<int> {
 In order to run tests, you need to add a dependency on package:test in your
 pubspec.yaml file:
 
-${ansi.emphasized('dev_dependencies:\n  test: any')}
+${ansi.emphasized('dev_dependencies:\n  test: ^1.0.0')}
 
 See https://pub.dev/packages/test#-installing-tab- for more information on
 adding package:test, and https://dart.dev/guides/testing for general

pkg/dartdev/test/commands/test_test.dart

@@ -43,12 +43,6 @@ void defineTest() {
         'In order to run tests, you need to add a dependency on package:test',
       ),
     );
-    expect(
-      result.stdout,
-      contains(
-        'dev_dependencies:\n  test: any',
-      ),
-    );
   }, skip: 'https://github.com/dart-lang/sdk/issues/40854');
 
   test('has dependency', () {