Install pip when not detected when attempting to install ipykernel

[rchiodo]

In this bug here, #7737 @mjbvz was having trouble installing ipykernel (well because /usr/bin/python didn't have pip)

Why can't we just run python -m ensurepip --upgrade? (as indicated here: https://pip.pypa.io/en/stable/installation/#supported-methods)

[DonJayamanne]

Python extension didn't want this done when I was planning on submitting a PR for their extension.
We are awaiting on telemetry for this (which was added recently)

[DonJayamanne]

I totally agree, we should do this, even Kai ran into this, i think Sid and a number of others have run into this very often.
Its a no brainer solution to getting users unblocked, right now we just display a message can't install and go fiture, which isn't a great message for users, they are left scratching their heads

[greazer]

What is the telemetry going to tell us? What percentage of people failed to install one of our dependencies because they didn't have pip installed? And if that number is high, we use it to convince Python to enable this? :) Or are there other reasons that Python doesn't think this is a good idea?

[rchiodo]

/verified