Improved Requests page test (#8441)

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### Motivation and context
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The restored project in case of testing importing backup was not
deleted.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Updated the test case description for clarity regarding project import
functionality.

- **Tests**
- Expanded test coverage to include navigation to the projects list,
project opening attempts, and deletion actions after backup import,
ensuring expected behavior post-restoration.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tests/cypress/e2e/features/requests_page.js

@@ -293,7 +293,7 @@ context('Requests page', () => {
             });
         });
 
-        it('Import backup creates a request. Project  can not be opened.', () => {
+        it('Import backup creates a request. Project can not be opened.', () => {
             cy.restoreProject(
                 `${backupArchiveName}.zip`,
             );
@@ -303,6 +303,10 @@ context('Requests page', () => {
                 cy.get('.cvat-request-item-progress-success').should('exist');
                 cy.get('.cvat-requests-name').should('not.exist');
             }, { checkResourceLink: false });
+
+            cy.goToProjectsList();
+            cy.openProject(projectName);
+            cy.deleteProjectViaActions(projectName);
         });
     });