Cypress. Case 44. Adding additional checks.

[dvkruchinin]

Motivation and context

This test often fails due to the aria-label="edit" visibility check when changing label attributes.

Timed out retrying after 25000ms: `cy.should()` failed because this element is detached from the DOM.

Adding additional checks for the existence and visibility of the parent elements should solve this problem. This version of the updated test was tested in my fork by restarting jobs about 40 times. The test never failed with an error.

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT