fix(BA-4280): Prevent scoped_query from overriding project param with group_id

[jopemachine]

resolves (BA-4280)

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue
• Installer updates including:
  • Fixtures for db schema changes
  • New mandatory config options
• Update of end-to-end CLI integration tests in ai.backend.test
• API server-client counterparts (e.g., manager API -> client SDK)
• Test case(s) to:
  • Demonstrate the difference of before/after
  • Demonstrate the flow of abstract/conceptual models with a concrete implementation
• Documentation
  • Contents in the docs directory
  • docstrings in public interfaces and type annotations

[Copilot]

Pull request overview

This pull request fixes a bug in the scoped_query decorator where the project parameter was being silently overridden by the group_id parameter. The fix removes two problematic lines that were unconditionally replacing project with group_id when both parameters were present.

Changes:

• Removed buggy code in scoped_query that overwrote the project parameter with group_id
• Added regression test to ensure project and group_id parameters remain distinct
• Added changelog entry documenting the fix

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/ai/backend/manager/api/gql_legacy/base.py	Removes two lines that incorrectly overwrote project parameter with group_id
tests/unit/manager/api/test_gql_legacy_scoped_query.py	Adds regression test verifying project parameter is preserved when both project and group_id are provided
changes/8628.fix.md	Changelog entry documenting the bug fix

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[github-actions]

Backport to 25.15 is failed. Please backport manually.

[github-actions]

Backport to 25.6 is failed. Please backport manually.