Add npm install fallback and remove unused variable

Added a fallback npm install command in the Jenkinsfile to handle legacy peer dependencies. Also removed an unused variable from genericForm.tsx to improve code clarity and performance.

src/components/form/genericForm.tsx

@@ -11,7 +11,6 @@ const GenericForm = (formData: FormData) => {
     const backend: string = formData.backend;
     const userInput: UserInput = formData.userInput;
     const spec: Yup.Schema<any> = formData.spec;
-    const backendFormname = formData.backendFormName
 
     const navigate = useNavigate();