Pick and add extra changes for 4.0.0 version #12772

Job	Run time
Install Rubygems on Windows (3.3)	3m 39s
Handling gems shipped by default with RVM (3.3, 3.3.9)	9s
Handling gems shipped by default with RVM (3.2, 3.2.9)	12s
Handling issues with a shared gem home (dev)	25s
Install Rubygems on Ubuntu (3.2, openssl)	2m 10s
Install Rubygems on Ubuntu (3.2, no-openssl)	1m 52s
Install Rubygems on Windows (jruby)	5m 25s
Handling gems shipped by default with RVM (3.4, 3.4.5)	9s
Install Rubygems on Windows (3.4)	3m 29s
Handling issues with a shared gem home (system)	24s
Install Rubygems on Ubuntu (3.3, openssl)	2m 13s
Install Rubygems on Ubuntu (3.4, no-openssl)	1m 43s
Install Rubygems on Windows (3.2)	3m 14s
Install Rubygems on Ubuntu (3.3, no-openssl)	1m 58s
Install Rubygems on Ubuntu (truffleruby, no-openssl)	3m 8s
Install Rubygems on Ubuntu (3.4, openssl)	1m 56s
Install Rubygems on Ubuntu (truffleruby, openssl)	3m 22s
Install Rubygems on Ubuntu (jruby, no-openssl)	2m 53s
Install Rubygems on Ubuntu (jruby, openssl)	3m 8s
All install-rubygems jobs pass	3s
	41m 32s

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