Issue:
fix: remove internal entity type

We can remove type internal.
TODO:
- Being internal is the property of role and does not depend on entity type
- We can remove logic for internal entity type and transfer it use role.is_internal() wherever it is being used in the code.
- The mini logics like get entity type can be altered it won't take entity type internal to consideration.

Once this is done,
We need to migrate entity type internal in DB to Merchant.

Resolution:
<think>
PR Context:
- Title: fix(users): remove internal entity type for users
- Merged: 2024-09-26T14:30:04Z
- Files changed: 10 files
- Commits: 8 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
Remove internal from entity type. Being internal is the property of role and does not depend on entity type. Even internal role can have the entity types as 'Merchant', 'Org' or 'Profile'

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the 
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(users): remove internal entity type for users (#6013)
Co-authored-by: hyperswitch-bot[bot] <1485
Files to modify:


**crates/common_enums/src/enums.rs**
  Modify existing code

**crates/diesel_models/src/user_role.rs**
  Modify existing code

**crates/router/src/core/user.rs**
  Modify existing code

**crates/router/src/core/user_role.rs**
  Modify existing code

**crates/router/src/core/user_role/role.rs**
  Modify existing code

**crates/router/src/services/authorization/roles/predefined_roles.rs**
  Modify existing code

**crates/router/src/types/domain/user.rs**
  Remove:
    - function: pub::insert_in_v1_and_v2
    - struct: pub::InternalLevel
    - impl: impl NewUserRole<InternalLevel>

**crates/router/src/utils/user_role.rs**
  Modify existing code