Remove builtin methods with two self arguments

[Akirathan]

Follow-up of #13962

Part of #11686

Pull Request Description

Builtin methods do not accept two self arguments. Remove boolean field from IR node. Decrease expected IR cache sizes.

Important Notes

• Removed isStaticWrapperForInstanceMethod boolean field from Method.Explicit IR.
  • impact on cache sizes: reduction by 500 KB.
• Removed isStaticInstance parameter from generated builtin method code.
  • This simplifies the generated code.
  • It used to receive two self arguments. Now, it receives a single self argument.
• Reduce the expected IR cache size.
  • 7d906ef
  • Reduce from 130MB to 100MB.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.
• If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries,
  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[JaroslavTulach]

• A lot of removed code. That's very nice!
• The effort of #13962 seems to pay off!