Refactor CRC shell detection mechanism to use process parent programatically

[rohanKanojia]

Description

Originally posted by @cfergeau in #4526 (comment)

If we want to do some more extensive shell guessing by iterating over processes, could we not limit ourselves to the parents of the crc process?
I'd prefer that we extend this approach and drop the calls to an external command, and the parsing which comes with it.
In the scenario described above on macos, with pstree I get this so I can find the right terminal without relying on "latest launched"
(I'm not suggesting to use pstree directly, but to do something similar in go)

Acceptance Criteria

• Investigate whether shell can be detected correctly using parent process approach programmatically without using any command
• If investigation is successful , refactor current shell detection mechanism to be based on this approach.

[cfergeau]

I'd summarize this as

getNameAndItsPpid may not have the behaviour we want now, but can it be fixed to do what we need? Imo, this is what we want to do, start from the current process, and look at the process names/command lines until one is a shell process.