Add test to ensure 'download_concurrency' config is surfaced. (#280)

* Add test to ensure 'download_concurrency' config is surfaced.

* Fix filename and test name.

* Navigate directly to the page, rather than clicking the nav.

* Select using aria labels, text for better reliability and readability

Author: Henderson Hummel

test/cypress/integration/repo_management.js

@@ -0,0 +1,18 @@
+describe('Repo Management tests', () => {
+    let host = Cypress.env('host');
+    let adminUsername = Cypress.env('username');
+    let adminPassword = Cypress.env('password');
+
+    beforeEach(() => {
+        cy.visit(host)
+    });
+
+    it('admin user sees download_concurrency in remote config', () => {
+        cy.login(adminUsername, adminPassword);
+        cy.visit(host + 'ui/repositories?page_size=10&tab=remote');
+        cy.get('[aria-label="Actions"]:first').click(); // click the kebab menu on the 'community' repo
+        cy.contains('Edit').click();
+        cy.contains('Show advanced options').click();
+        cy.get('#download_concurrency').should('exist');
+    });
+});