fix(BA-1200): Wrong types in ResourcePolicy GQL modifier

[jopemachine]

resolves #NNN (BA-1200).

Checklist: (if applicable)

• Mention to the original issue

[Copilot]

Pull Request Overview

This PR fixes type mismatches in the GraphQL modifiers for KeyPair resource policies. The key changes include:

• Changing the type of default_for_unspecified from Optional[str] to Optional[DefaultForUnspecified] in both the creator and modifier.
• Updating max_pending_session_resource_slots from Optional[dict[str, Any]] to Optional[ResourceSlot] for stronger type consistency.
• Adjusting the conversion logic in the model to reflect the updated types.

Reviewed Changes

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

File	Description
src/ai/backend/manager/services/keypair_resource_policy/types.py	Updates type annotations in KeyPairResourcePolicyCreator for default_for_unspecified and max_pending_session_resource_slots
src/ai/backend/manager/services/keypair_resource_policy/actions/modify_keypair_resource_policy.py	Adjusts the modifier’s field types to use DefaultForUnspecified and ResourceSlot
src/ai/backend/manager/models/resource_policy.py	Revises the GraphQL-to-modifier conversion for default_for_unspecified via OptionalState

Comments suppressed due to low confidence (2)

src/ai/backend/manager/services/keypair_resource_policy/types.py:12

• Verify that the GraphQL input for default_for_unspecified is properly converted to the DefaultForUnspecified type. Ensure any conversion logic (present in the input transformation) is aligned with this type change to avoid runtime issues.

default_for_unspecified: Optional[DefaultForUnspecified]

src/ai/backend/manager/services/keypair_resource_policy/types.py:17

• Confirm that the conversion logic for max_pending_session_resource_slots matches the new ResourceSlot type and that any GraphQL input conversion is updated accordingly.

max_pending_session_resource_slots: Optional[ResourceSlot]