feat(router): add limit to `generic_user_roles_list_for_org_and_extra`

[vil02]

Type of Change

• [ ] Bugfix
• [x] New feature
• [x] Enhancement
• [ ] Refactoring
• [ ] Dependency updates
• [ ] Documentation
• [ ] CI/CD

Description

This PR adds the limit parameter to the generic_user_roles_list_for_org_and_extra function.

Additional Changes

• [ ] This PR modifies the API contract
• [ ] This PR modifies the database schema
• [ ] This PR modifies application configuration/environment variables

Motivation and Context

Fixes #5917

How did you test it?

Checklist

• [ ] I formatted the code cargo +nightly fmt --all
• [x] I addressed lints thrown by cargo clippy
• [ ] I reviewed the submitted code
• [ ] I added unit tests for my changes where possible

[semanticdiff-com[bot]]

Review changes with SemanticDiff.

Analyzed 3 of 3 files.

	Filename	Status
:heavy_check_mark:	crates/router/src/db/user_role.rs	Analyzed
:heavy_check_mark:	crates/router/src/core/user_role.rs	Analyzed
:heavy_check_mark:	crates/diesel_models/src/query/user_role.rs	Analyzed