feat: Implement get role mappings API endpoint

packages/backend/test/mocks/rest/api/v1/admin/saml-auth-providers/get-role-mappings.ee.js

@@ -0,0 +1,23 @@
+const getRoleMappingsMock = async (roleMappings) => {
+  const data = roleMappings.map((roleMapping) => {
+    return {
+      id: roleMapping.id,
+      samlAuthProviderId: roleMapping.samlAuthProviderId,
+      roleId: roleMapping.roleId,
+      remoteRoleName: roleMapping.remoteRoleName,
+    };
+  });
+
+  return {
+    data: data,
+    meta: {
+      count: data.length,
+      currentPage: null,
+      isArray: true,
+      totalPages: null,
+      type: 'SamlAuthProvidersRoleMapping',
+    },
+  };
+};
+
+export default getRoleMappingsMock;