fix(GraphQL Editor): make inputValueDeprecation optional and change variable mode to json

[gatzjames]

Highlights:

• Changes the variables mode to json to fix an issue where variables require a leading comma and are not used in the end.
• Makes the inputValueDeprecation optional since there are introspection APIs that do not support it and fetching the schema fails on them

Closes INS-4229

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ SyntaxError: Syntax Error: Unexpected Name "curl". (1:1) > 1 | curl -kv POST (rib/graphql --header 'Auth... View Issue

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