Add Entra ID theme (#439)

Author: timja

src/main/java/io/jenkins/plugins/darktheme/DarkThemeManagerFactory.java

@@ -15,6 +15,7 @@ public class DarkThemeManagerFactory extends ThemeManagerFactory {
     public static final String ACE_EDITOR_THEME = "tomorrow_night";
     public static final String PRISM_THEME = "tomorrow";
     public static final String BOOTSTRAP_THEME = "dark";
+    public static final String ENTRA_ID_THEME = "dark";
 
     @DataBoundConstructor
     public DarkThemeManagerFactory() {
@@ -25,6 +26,7 @@ public Theme getTheme() {
         return Theme.builder()
                 .withCssUrl(getCssUrl())
                 .withProperty("ace-editor", "theme", ACE_EDITOR_THEME)
+                .withProperty("entra-id", "theme", ENTRA_ID_THEME)
                 .withProperty("prism-api", "theme", PRISM_THEME)
                 .withProperty("bootstrap", "theme", BOOTSTRAP_THEME)
                 .build();

src/main/java/io/jenkins/plugins/darktheme/DarkThemeSystemManagerFactory.java

@@ -21,6 +21,7 @@ public Theme getTheme() {
         return Theme.builder()
             .respectSystemAppearance()
             .withProperty("ace-editor", "theme-dark", ACE_EDITOR_THEME)
+            .withProperty("entra-id", "theme", ENTRA_ID_THEME)
             .withProperty("prism-api", "theme-dark", PRISM_THEME)
             .withProperty("bootstrap", "theme-dark", BOOTSTRAP_THEME)
             .build();