Tell Jenkins the username is also secret.

Author: pjdarton

src/main/java/io/jenkins/plugins/credentials/secretsmanager/factory/username_password/AwsJsonUsernamePasswordCredentials.java

@@ -55,7 +55,12 @@ public String getUsername() {
         return getFieldFromSecretJson(JSON_FIELDNAME_FOR_USERNAME);
     }
 
-    @Extension
+    @Override
+	public boolean isUsernameSecret() {
+		return true;
+	}
+
+	@Extension
     @SuppressWarnings("unused")
     public static class DescriptorImpl extends BaseStandardCredentialsDescriptor {
         @Override

src/test/java/io/jenkins/plugins/credentials/secretsmanager/factory/username_password/AwsJsonUsernamePasswordCredentialsTest.java

@@ -54,6 +54,25 @@ public void getUsernameGivenValidJsonThenReturnsUsername() {
         assertThat(actual).isEqualTo(expected);
     }
 
+	@Test
+	public void isUsernameSecretGivenAnythingThenReturnsTrue() {
+		// Given
+		final String id = "testId";
+		final String description = "some test description";
+		final boolean expected = true;
+		final String usernamePasswordJson = mkUsernameAndPasswordJson("myUser", "mySecretPassword");
+		final Secret stubSecret = Secret.fromString(usernamePasswordJson);
+		final Supplier<Secret> stubSupplier = new StubSupplier<>(stubSecret);
+		final AwsJsonUsernamePasswordCredentials instance = new AwsJsonUsernamePasswordCredentials(id, description,
+				stubSupplier);
+
+		// When
+		final boolean actual = instance.isUsernameSecret();
+
+		// Then
+		assertThat(actual).isEqualTo(expected);
+	}
+
     @Test
     public void getUsernameGivenInvalidJsonThenReturnsThrows() {
         // Given