[ruby/irb] Clear all context usages in RubyLexHEADmaster

(https://github.com/ruby/irb/pull/684)

After this change, `RubyLex` will not interact with `Context` directly
in any way. This decoupling has a few benefits:

- It makes `RubyLex` easier to test as it no longer has a dependency on
  `Context`. We can see this from the removal of `build_context` from
  `test_ruby_lex.rb`.
- It will make `RubyLex` easier to understand as it will not be affected
  by state changes in `Context` objects.
- It allows `RubyLex` to be used in places where `Context` is not available.

https://github.com/ruby/irb/commit/d5b262a076

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