add tests for workspace booking contract functionality

[Tinna23]

closes #608

Description:
This PR builds upon the foundational test setup to introduce comprehensive test coverage for the workspace registration flow in the workspace_booking smart contract. It verifies the happy path for creating a workspace, as well as the expected failure modes for duplicate entries and unauthorized access.

Key Changes:

• Added test_register_workspace_success: * Initializes the contract and successfully registers a new workspace ("ws-001", "Hot Desk A", WorkspaceType::HotDesk, capacity 1, rate 500).

• Verifies the state by querying get_workspace and asserting that all fields (name, workspace_type, capacity, hourly_rate, is_available) are correctly stored.

• Asserts that get_all_workspaces().len() == 1.

• Added test_register_workspace_duplicate_id_fails: * Verifies that attempting to register the exact same workspace ID ("ws-001") twice triggers a panic with the expected WorkspaceAlreadyExists = 5 error (Error(Contract, #5)).

• Added test_register_workspace_non_admin_fails: * Generates a separate non_admin address and attempts to call register_workspace.

• Ensures the contract panics with the expected Unauthorized = 2 error (Error(Contract, #2)).

• Environment Setup: Utilized env.mock_all_auths() across tests to uniformly bypass authorization checks during testing.

Files Modified:

• contracts/workspace_booking/src/test.rs

Acceptance Criteria Met:

• All 5 tests (2 initialization + 3 registration) pass successfully using cargo test -p workspace_booking.
• test_register_workspace_success correctly asserts all workspace fields.
• test_register_workspace_duplicate_id_fails correctly catches the Error(Contract, #5) panic.
• test_register_workspace_non_admin_fails correctly catches the Error(Contract, #2) panic.

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