feat: Implement get role mappings API endpoint

packages/backend/test/factories/role-mapping.js

@@ -0,0 +1,16 @@
+import { createRole } from './role.js';
+import { createSamlAuthProvider } from './saml-auth-provider.ee.js';
+import SamlAuthProviderRoleMapping from '../../src/models/saml-auth-providers-role-mapping.ee.js';
+
+export const createRoleMapping = async (params = {}) => {
+  params.roleId = params?.roleId || (await createRole()).id;
+  params.samlAuthProviderId =
+    params?.samlAuthProviderId || (await createSamlAuthProvider()).id;
+
+  params.remoteRoleName = params?.remoteRoleName || 'User';
+
+  const samlAuthProviderRoleMapping =
+    await SamlAuthProviderRoleMapping.query().insertAndFetch(params);
+
+  return samlAuthProviderRoleMapping;
+};