Fix cypress by using new stage "TESTING"

Cypress did not work because of the stricter security header. We introduced a new stage named "TESTING" which ignores this security headers and allow testing tools to work as intended.

Committed-by: Konstantin Schaper <konstantin.schaper@cloudogu.com>

scm-ui/e2e-tests/cypress/integration/repository_code_filesearch_spec.ts

@@ -34,6 +34,7 @@ describe("Repository File Search", () => {
     // Create user and login
     username = hri.random();
     password = hri.random();
+    cy.restSetConfig({ enabledFileSearch: true });
     cy.restCreateUser(username, password);
     cy.restLogin(username, password);