add warning when shell integration fails and create a terminal

[meganrogge]

This PR fixes #151934

[meganrogge]

ideally, the single tab would have the action too, but not possible ATM. worth doing @Tyriar ?

[Tyriar]

@meganrogge I think that's tracked elsewhere, fine to leave that out

[Tyriar]

When I add exit 100 to the bash shell integration script the terminal is created and closes, relaunching without injection doesn't seem to happen for me?

[meganrogge]

think I see what's wrong. fixing

[meganrogge]

I was only accounting for the case when createProcess returns an error. Now also handle when the process exits during launch or is killed by the process when shell integration injection is used

[meganrogge]

these tests are failing consistently will investigate on Monday

[Tyriar]

I think the warning on the tab and hover looks great. Seeing exit code undefined when using exit 100 at the end of the script though:

Could be related to the test failure:

  1) vscode API - terminal
       Terminal
         Extension pty terminals
           exitStatus.code should be set to the exit code (non-zero)

[Tyriar]

Tweaked the message: