fix(typescript-urql): optional options for subscription

[danielkaxis]

Description

When generating subscription, it now checks if
variables are required and generates correct
options argument to the function.

Related #372

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

I first made a yarn patch in my project to fix my issue.
In graphql-code-generator-community repo I added tests
to make sure it creates optional and required options if variables are required.

Test Environment:

• OS: Linux
• "@graphql-codegen/add": "4.0.1"
• "@graphql-codegen/cli": "3.3.1"
• "@graphql-codegen/typescript": "3.0.4"
• "@graphql-codegen/typescript-operations": "3.0.0"
• "@graphql-codegen/typescript-react-apollo": "3.3.7"
• "@graphql-codegen/typescript-urql": "3.7.3"
• "@graphql-codegen/plugin-helpers": "4.2.0"
• "@graphql-codegen/typescript-resolvers": "3.2.1"
• "@graphql-codegen/urql-introspection": "2.2.1"
• NodeJS: 16.14.2

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose
the solution you did and what alternatives you considered, etc...

[changeset-bot]

🦋 Changeset detected

Latest commit: 766170d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphql-codegen/typescript-urql	Patch

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