Remove parameters from the graphql diagram references

[samithkavishke]

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This PR fix the #1037

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[dulajdilshan]

@samithkavishke Let's add some tests covering the following cases

• Methods in a GraphQL service class has parameters with reference types of imported and local types
• Methods in Class type has parameters with reference type - This would test the skipParameters = false case

[dulajdilshan]

@samithkavishke There are some checkstyle issues. Shall we resolve them?

[pasindufernando1]

@samithkavishke The fix for the build failure is now merged. You can sync it to resolve the failures

[pasindufernando1]

LGTM

[dulajdilshan]

LGTM!