Exclude the unneeded subprojects in API validation, remove their "api" directories, and run apiDump and check to verify it works

Author: ShreckYe

build.gradle.kts

@@ -11,4 +11,9 @@ apiValidation {
     klib {
         enabled = true
     }
+
+    ignoredProjects += listOf(
+        "compose-multiplatform-html-unified-demo",
+        "compose-multiplatform-html-unified-common-legacy"
+    )
 }