Add futureProofUnions config to client preset

[liautaud]

• Related to: [client-preset] allowed options and defaults #8562
• Related to: Add futureProofEnums config to client preset #9683

Description

Hooks the futureProofUnions config option from the typescript plugin to the client preset, which was already done in #9683 for futureProofEnums.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

The change was tested locally.

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

[changeset-bot]

🦋 Changeset detected

Latest commit: bd26cef

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/client-preset	Minor

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