[rubygems/rubygems] Rework `bundle gem` specs so that they work on WindowsHEADmaster

Most of the commands run by these specs actually prompt for user input
but for some reason `Open3` outside of Windows ignores that and goes on
with no user input. Windows does not like this.

This commit refactors these specs so that:

* They don't prompt for user input when not necessary.
* They pass proper user input when necessary.

As long as no user input is needed, most specs pass, so it allows to
remove the `:readline` tag from most of them.

https://github.com/rubygems/rubygems/commit/3dfabcdae4

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