Draft: ide/python-lsp-server: Enable pylint

JCWasmx86 requested to merge JCWasmx86/gnome-builder:activatePylint into main

The code should theoretically work, but I don't get any diagnostics from the language server, even for code like this:

x = 0
x-- # Invalid syntax, but no diagnostics

The configuration options are here: https://github.com/python-lsp/python-lsp-server/blob/develop/CONFIGURATION.md And for later, this requires e.g. some sort of GUI to manage enabled/disabled plugins.

Furthermore I added pylint to the flatpak manifest

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