appiumtests: test combination of `IgnoreImages` `IgnoreSelection` `SelectionTextOnly`

Fushan Wenrequested to merge
work/fuf/488302 into master

Reason for the change

Improve test coverage

Test plan

  1. Open the widget
  2. Disable IgnoreImages
  3. Copy 3 images to the clipboard and match them in the history list
  4. Disable IgnoreSelection and SelectionTextOnly
  5. Copy another 3 images to the primary clipboard and match them in the history list

Screenshots or screen recordings

appium_artifact_org.kde.plasma.clipboard____main__.ClipboardTest.test_4_ignore_image-1

Bugs fixed

Edited by Fushan Wen

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