Move all terminal contributions to run on restored phase

[Tyriar]

Part of #156864

Discussion about this in b52be01. This doesn't seem to impact the terminal start up experience, at least on my machine.

cc @meganrogge

[bpasero]

thanks 🚀

[Tyriar]

This ended up causing a regression to reconnect:

ERR Cannot get default system shell when there is no backend for remote authority 'undefined': Error: Cannot get default system shell when there is no backend for remote authority 'undefined'
    at Object.getDefaultSystemShell (vscode-file://vscode-app/c:/Github/microsoft/vscode/out/vs/workbench/contrib/terminal/electron-sandbox/terminalProfileResolverService.js:24:31)
    at ElectronTerminalProfileResolverService._getUnresolvedFallbackDefaultProfile (vscode-file://vscode-app/c:/Github/microsoft/vscode/out/vs/workbench/contrib/terminal/browser/terminalProfileResolverService.js:240:52)
    at ElectronTerminalProfileResolverService._getUnresolvedDefaultProfile (vscode-file://vscode-app/c:/Github/microsoft/vscode/out/vs/workbench/contrib/terminal/browser/terminalProfileResolverService.js:186:67)
    at async ElectronTerminalProfileResolverService.getDefaultProfile (vscode-file://vscode-app/c:/Github/microsoft/vscode/out/vs/workbench/contrib/terminal/browser/terminalProfileResolverService.js:137:41)
    at async vscode-file://vscode-app/c:/Github/microsoft/vscode/out/vs/workbench/contrib/terminal/browser/terminalInstance.js:225:45

[Tyriar]

#159761