Cypress. Adapting tests to run in CI nightly. (#3370)

* Cypress. Skipping test "Export, import an annotation task" for Firefox.

* Updated case 37 for Firefox

* Redesign the test

tests/cypress/integration/actions_objects/case_37_object_make_copy.js

@@ -192,7 +192,7 @@ context('Object make a copy.', () => {
         it('Copy a shape with holding "Ctrl".', () => {
             const keyCodeC = 67;
             const keyCodeV = 86;
-            cy.get('#cvat_canvas_shape_18').trigger('mousemove').should('have.class', 'cvat_canvas_shape_activated');
+            cy.get('.cvat_canvas_shape').first().trigger('mousemove').should('have.class', 'cvat_canvas_shape_activated');
             cy.get('body').type('{ctrl}', {release: false}); // Hold
             cy.get('body')
                 .trigger('keydown', {keyCode: keyCodeC, ctrlKey: true})

tests/cypress/integration/actions_tasks2/case_97_export_import_task.js

@@ -4,7 +4,7 @@
 
 /// <reference types="cypress" />
 
-context('Export, import an annotation task.', () => {
+context('Export, import an annotation task.', { browser: '!firefox' }, () => {
     const caseId = '97';
     const labelName = 'car';
     const taskName = `Case ${caseId}`;
@@ -60,7 +60,7 @@ context('Export, import an annotation task.', () => {
         cy.deleteTask(taskName);
     });
 
-    describe(`Testing "${labelName}"`, () => {
+    describe(`Testing "${taskName}"`, () => {
         it('Export a task.', () => {
             cy.contains('.cvat-item-task-name', taskName)
                 .parents('.cvat-tasks-list-item')