fix(user_roles): Send only same and below Entity Level Users in List Users API

[ThisIsMani]

Type of Change

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

Description

• Send only same and below Entity Level Users in List Users API.

Additional Changes

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

Motivation and Context

Closes #6146.

How did you test it?

curl 'http://localhost:8080/user/user/v2/list' \
  -H 'authorization: Bearer JWT' \

This API when called with merchant level users, it should not send org level users in response. Can be tested via control center.

Checklist

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

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 2 of 2 files.

Overall, the semantic diff is 25% smaller than the GitHub diff.

	Filename	Status
✔️	crates/router/src/utils/user_role.rs	32.71% smaller
✔️	crates/router/src/core/user_role.rs	Analyzed