[feature] SC-166737/improve app proxy security by restricting where token replacements can go

[HappyPaul55]

This pull request adds settings injection functionality to the manifest.json file, allowing sensitive credentials to be dynamically injected into API requests. This improves security and flexibility for authentication and authorization.

Settings injection for API requests:

• Added settingsInjection for the __instance_url__ endpoint, enabling the access_token to be injected into the Authorization header.
• Added settingsInjection for the https://login.wrike.com/oauth2/.* endpoint, enabling client_id and client_secret to be injected into the request body.

[github-actions]

Build for commit f77304b deployed to: https://wrike-pr-75.ci.next.deskprodemo.com

URLs:
https://wrike-pr-75.ci.next.deskprodemo.com/horizon-ui/app

[Copilot]

Pull Request Overview

This PR adds settingsInjection configuration to the manifest.json to enable dynamic credential injection into API requests through the proxy whitelist, improving security by allowing sensitive credentials to be automatically injected rather than manually constructed in code.

• Added settings injection for the instance URL endpoint to inject access_token into the Authorization header
• Added settings injection for the Wrike OAuth2 endpoint to inject client_id and client_secret into request bodies

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