Align the diagnostics in CheckMissingRequires

Make the MISSING_REQUIRE diagnostics default to warning, and the
MISSING_REQUIRE_TYPE diagnositcs default to disabled.

This is a step toward unifying behavior of this pass inside goog.provide files
and outside, and may also help with replacing the CheckMissingAndExtraRequires
pass, which doesn't have an equivalent of the MISSING_REQUIRE_TYPE diagnostics.

PiperOrigin-RevId: 325847664

Author: blickly

src/com/google/javascript/jscomp/CheckMissingRequires.java

@@ -42,14 +42,14 @@ public class CheckMissingRequires extends AbstractModuleCallback implements Comp
               + "use the alias instead.");
 
   public static final DiagnosticType MISSING_REQUIRE_TYPE =
-      DiagnosticType.warning(
+      DiagnosticType.disabled(
           "JSC_MISSING_REQUIRE_TYPE",
           "''{0}'' references a fully qualified namespace, which is disallowed by the style"
               + " guide.\nPlease add a goog.requireType, assign or destructure it into an alias, "
               + "and use the alias instead.");
 
   public static final DiagnosticType MISSING_REQUIRE_IN_PROVIDES_FILE =
-      DiagnosticType.disabled(
+      DiagnosticType.warning(
           "JSC_MISSING_REQUIRE_IN_PROVIDES_FILE",
           "''{0}'' references a namespace which was not required by this file.\n"
               + "Please add a goog.require.");

test/com/google/javascript/jscomp/CheckMissingRequiresTest.java

@@ -39,6 +39,7 @@ protected CompilerPass getProcessor(Compiler compiler) {
   @Override
   protected CompilerOptions getOptions() {
     CompilerOptions options = super.getOptions();
+    options.setWarningLevel(DiagnosticGroups.STRICTER_MISSING_REQUIRE_TYPE, CheckLevel.WARNING);
     options.setWarningLevel(
         DiagnosticGroups.STRICTER_MISSING_REQUIRE_IN_PROVIDES_FILE, CheckLevel.WARNING);
     options.setWarningLevel(