[MFTF] User deletes images from context menu

[filmaj]

Description

Implement MFTF test to cover scenario: "User deletes images contextually" (story 42, #461)

Preconditions

1. Admin User is logged into Admin Panel
2. At least one image is present in the media gallery

Test steps

1. Open Media Gallery
2. Open the menu for an image (clicking on three dots)
3. Click the Delete option from the menu
4. User sees the image disappear from the gallery. The image information is deleted from the data base.