fix: avoid name collision on java model build step

[dpilch]

Description of changes

Avoid name collision on Java model build step by adding Build if name is used by a type.

See #695 for details.

It is still possible for a collision to occur if the model has a second type that includes Build.

type TutorialStep {
  position: Int!
  text: String!
}

type TutorialBuild {
  position: Int!
  text: String!
}

type MyObject @model {
  id: ID!
  tutorial: [TutorialStep]
  tutorialBuild: [TutorialBuildStep]
}

We could add another layer of checks or use a randomly generated string, but I think this case is so rare that it should be ok.

Issue #, if available

Resolves #695

Description of how you validated changes

Unit tests

Checklist

• PR description included
• yarn test passes
• Tests are changed or added

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[AaronZyLee]

This could still collide if for a model A, there are AStep and ABuildStep in the fields. But it should be a rare case. The implementation is enough to fix the issue.

[dpilch]

I agree that this case would be so rare that this fix should be sufficient.