ui: Refactor data-attrs constants, enum for bool strings (#27002)

* refactor: Data-attribute constants + boolean string enum

* refactor: Use CSS class string constants

* refactor: Address review comments

tools/ui/src/lib/enums/boolean-string.enums.ts

@@ -0,0 +1,5 @@
+/** String representation of a boolean used in data attributes and persisted values. */
+export enum BooleanString {
+	TRUE = 'true',
+	FALSE = 'false'
+}