fix(Data Mapper): Paste into test tool using right mouse click not working

[Elaina-Lee]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  bug fix
• What is the current behavior? (You can also link to an open issue here)
  the test panel does not let users cut/copy/paste using the mouse right click context menu
• What is the new behavior (if this is a feature change)?
  the test panel lets users cut/copy/paste using the mouse right click context menu
• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  no
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