Test: Editor open and editor open with regression testing

[lramos15]

Refs: #100281

• anyOS @kieferrm
• anyOS @sana-ajani
• Windows @joaomoreno

Complexity: 3

Authors: @lramos15, @bpasero

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A refactor of the way opening an editor, specifically the openWith scenario was done to reduce code debt. See #116856. To test please install a custom editor and a custom notebook (Hex Editor and markdown notebooks are just a few examples).

Try various open and open with scenarios. E.x

• Split Editors
• Reopen with from command palette using ctrl / alt click modifiers
• Open with from the explorer context menu
• Ensure settings editor and keybinding editor still work