add nginz rules for missing endpoints

[battermann]

The following endpoints were not covered before:

• POST /teams/:tid/apps/:app/cookies
• DELETE /teams/:tid/collaborators/:uid

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[Copilot]

Pull Request Overview

This PR adds nginx routing rules for two previously uncovered API endpoints in the nginz configuration. The changes ensure proper routing for team collaboration and app cookie management endpoints.

Key changes:

• Added routing rule for team collaborator deletion endpoint
• Added routing rule for team app cookies endpoint
• Added changelog entry documenting the bug fix

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
charts/nginz/values.yaml	Added two new path rules for /teams/:tid/collaborators/:uid and /teams/:tid/apps/:app/cookies endpoints
changelog.d/3-bug-fixes/nginz-rules	Added changelog entry for the nginx rules addition

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