test(e2e): Add integration tests for token lifecycle and RBAC upgrade

[teefeh-07]

test(e2e): Add integration tests for token lifecycle and RBAC upgrade

Description

This PR adds comprehensive integration tests to cover two critical flows within the bc-forge ecosystem:

1. Full token lifecycle with all roles - Validates the complete token lifecycle including initialization, minting, transferring, burning, and pausing, while correctly interacting with the RBAC role system (Minter, Pauser, SuperAdmin).
2. Upgrade path from old Admin to new RBAC - Validates the migration path from the legacy Admin model to the new Role-Based Access Control (RBAC) model, ensuring the Admin correctly receives the SuperAdmin role.

Changes

1. Added Integration Tests in e2e/integration_test.rs

• Implemented test_full_token_lifecycle_with_all_roles to test the token lifecycle with role segregation.
• Implemented test_upgrade_path_from_old_admin_to_new_rbac to test the migrate_admin flow.
• Configured environment to correctly inject bc_forge_admin dependency for role assignments.

2. Updated e2e/Cargo.toml

• Added bc-forge-admin as a testutils dependency to e2e for testing the role assignments via bc_forge_admin::grant_role and bc_forge_admin::migrate_admin.

Tasks and Fixes Made

• Task: Write isolated integration test for full token lifecycle with all roles.
  • Fix: Handled role assignments and tested end-to-end flow using the Minter, Pauser, and SuperAdmin roles.
• Task: Write isolated integration test for upgrade path from old Admin to new RBAC.
  • Fix: Authored a test ensuring bc_forge_admin::migrate_admin properly maps the old Admin to SuperAdmin role without failing.

Validation

• End-to-end lifecycle test runs and validates all token operations correctly.
• Old Admin to new RBAC test passes reliably and validates edge cases around role validation.
• Compilation succeeds with the added testing dependencies in e2e/Cargo.toml.

Related Issues

• Closes [Testing] Integration: Full token lifecycle with all roles #482
• Closes [Testing] Integration: Upgrade path from old Admin to new RBAC #483

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