Test: terminal tab improvements

[meganrogge]

Refs #124715

• macOS @jrieken
• linux @deepak1556
• windows @stevencl

Complexity: 3

Authors: @Tyriar, @meganrogge

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Verify that you can:

• unsplit a terminal to a tab [Request] - Allow unsplitting a terminal to a tab #121278
• drag and drop terminal tabs Add drag and drop support to terminal tabs #121500
• see an indicator that a terminal task is running and it updates depending on whether or not there are errors Show an indicator if a terminal task tab is "running" #121659
• change the tab color and it persists on reload Support changing tab color #121738
• change the tab view width in both orientations and it persists on reload and when switching between them Keep track of user's tab view width in both orientations #121833
• double click the sash and it snaps nicely
• rename the terminal in the tabs view Allow renaming terminal tabs inside the tab view #122023
• split the terminal
  • by alt-clicking a tab Alt + click on a tab list item to split that terminal #122959
  • by alt-clicking the plus button Alt+click on the inline terminal tab should split it #123888
  • by alt-clicking the single tab on the terminal panel
• delete the terminal
  • by selecting 1+ w ctrl/cmd held down and pressing delete
  • using the inline trash button
  • via middle click Middle click on the inline terminal tab should kill it #123887
• join tabs Terminal tabs: allow to join tabs #122286
• drop a file on a tab and the file name gets pasted in the correct terminal support file drop on a terminal tab #123348