feat: implement fiscal ID validation; replace fiscal code validator and update related components

src/app/shared/components/fields/fiscal_id.component.ts

@@ -3,11 +3,12 @@ import { FormControl, ReactiveFormsModule } from '@angular/forms';
 import { InputComponent } from '../input/input.component';
 
 @Component({
-  selector: 'field-fiscal-code',
+  selector: 'field-fiscal-id',
   template: `<app-input
-    label="کد مالیاتی"
+    label="شناسه یکتا"
     [control]="control"
     [name]="name"
+    [length]="6"
     [isLtrInput]="true"
   />`,
   imports: [ReactiveFormsModule, InputComponent],