Compile without activesupport

[soutaro]

CI in ruby/ruby compiles rbs-gem because it's a bundled gem. But adding activesupport to compile environment is not a good idea.

This PR contains a few changes:

1. Stop hardcoding bundle exec ruby commandline (this is in fact unrelated to activesupport)
2. Stop triggering templates task always
3. Add generated files

With this PR, we can compile the extension without installing activesupport. 🎉

[soutaro]

@Morriar @amomchilov The problem is having activesupport in ruby/ruby CI. Another solution would be stop using activesupport. (Doesn't look too much difficult, but avoiding templates task looks easier to me.)

[Morriar]

iirc correctly we only use activesupport for underscore and demodulize, we could copy over these methods and remove the dependency if needed.

[Morriar]

I guess we don't need this anymore?

[ParadoxV5]

iirc correctly we only use activesupport for underscore and demodulize, we could copy over these methods and remove the dependency if needed.

• Remove the dependency to activesupport #2106