[Task]: Zendesk OAuth Client Need to Productionize

[NilanshBansal]

SubTasks

For using the Zendesk OAuth client in production we need to do the following:

1. Setup OAuth Client: https://docs-prod.useparagon.com/resources/integrations/zendesk (Done)
2. Set up a global OAuth client: https://developer.zendesk.com/documentation/marketplace/building-a-marketplace-app/set-up-a-global-oauth-client

For the 2nd point above we have asked the Paragon team to help us out, ref: https://theappsmith.slack.com/archives/C07NTH2TH3M/p1737114950871379