Remove all install.sh code that installs python and leave it to the user

[emlowe]

One approach to keeping the installer working on newer Ubuntu versions and whatnot is to add in the code to handle this. (see #15920 or #15130)

However, a simpler and more maintainable approach is to make the user responsible for installing the proper version of python, sqlite, and openssl

This PR here removes all the code that installs python, sqlite, and openssl and just checks for the existence of versions and exits out if the versions aren't present.

This is easier to manage and allows the installer to work on a variety of platforms including new Ubuntu versions and other more esoteric versions of Linux

This may break some AWS deployment scripts as the code to install and compile python for amazon linux is removed

[cmmarslender]

Generally in favor of these changes. In addition to simplifying, I think it also gets rid of all the cases of needing sudo in the install script, which is a problem for some environments we try to install this.

There are a couple more things that can be cleaned up if we aren't going to be installing system level packages:

PACMAN_AUTOMATED
SKIP_PACKAGE_INSTALL

These vars at the top don't end up used anymore

Additionally, there is a whole section that checks and defines UBUNTU and DEBIAN vars that are no longer used as well with these changes.

[wallentx]

https://github.com/Chia-Network/chia-blockchain/blob/main/install-gui.sh#L106-L178
It'd be nice to remove all this sudo usage in install-gui.sh
Given the popularity of nvm, and due to the fact that we are installing EOL nodejs:12 on some distros, it'd be much better if we simply did a min version check, and exit 1 stating that the user needs nodejs > $MIN_VERSION installed.

[altendky]

I know this is a bit self-centric, but I think it also is born out in the packages that get shipped. The system generally provides an easily accessible Python that will satisfy our requirements. The GUI requirements though are generally not provided in remotely recent enough versions. They are accessible more in the way that pyenv might provide Python where you have to go figure out what tool to acquire, how to use it, how to then create an isolated environment to work in and work in it and... That is functionality that this script retains for the Python side. So that's how I convinced myself that not installing Python was reasonable despite suggesting keeping the JS helpers stuff.

Maybe @ChiaMineJP can weigh in on how the GUI script works etc and how nvm compares to npm etc.

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[coveralls-official]

Pull Request Test Coverage Report for Build 7802799296

Warning: This coverage report may be inaccurate.

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A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 17 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+0.04%) to 90.881%

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Files with Coverage Reduction	New Missed Lines	%
chia/harvester/harvester_api.py	1	73.02%
tests/simulation/test_simulation.py	1	96.52%
chia/server/node_discovery.py	3	79.9%
chia/wallet/wallet_node.py	3	88.16%
chia/full_node/full_node.py	9	84.81%

Totals
Change from base Build 7792246483:	0.04%
Covered Lines:	96594
Relevant Lines:	106251

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💛 - Coveralls

[cmmarslender]

Looks good to me. Just leaving "comment" for now so others have a chance to review and provide feedback without this getting merged, since I would count for required reviewers

Ok with changes now, and just letting others take a look before approval