Test: Run recent command contiguous search and other improvements

[Tyriar]

Refs: #154016

• macOS @isidorn
• linux @deepak1556
• windows @DonJayamanne

Complexity: 3

Authors: @Tyriar, @meganrogge

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We made some tweaks to the run recent command quick pick to bring the experience closer to regular reverse search in shells. Please test the features called out in https://github.com/microsoft/vscode-docs/blob/vnext/release-notes/v1_70.md#run-recent-command-as-a-replacement-for-reverse-search

Try adding and using these keybindings:

{
    "key": "ctrl+r",
    "command": "workbench.action.terminal.runRecentCommand",
    "when": "terminalFocus"
},
// Allow ctrl+r again to go to the next command in the quick pick
{
  "key": "ctrl+r",
  "command": "workbench.action.quickOpenNavigateNextInViewPicker",
  "when": "inQuickOpen && inTerminalRunCommandPicker"
},
// Fallback to the shell's native ctrl+r
{
  "key": "ctrl+alt+r",
  "command": "workbench.action.terminal.sendSequence",
  "args": { "text": "\u0012"/*^R*/ },
  "when": "terminalFocus"
}