Test that casting tenancy_db_password to encrypted works as expected

[lukinovec]

Add a test that ensures that casting tenancy_db_password to encrypted works correctly ('tenancy_db_password' => 'encrypted' in the Tenant model's casts() method's returned array).

NOTE: using PermissionControlledMySQLDatabaseManager

Meaning:

• when creating a tenant, tenancy_db_password gets automatically encrypted (the encrypted password is saved in the DB)
• accessing the password like $tenant->tenancy_db_password returns the decrypted password
• the decrypted password is used for connecting to the tenant database, and the connection is successful (+ DB operations work as expected)

This works when both using a specific tenancy_db_password during tenant creation, and when not specifying any tenancy_db_password (in the latter case, the DB manager generates a random password for tenancy_db_password, which still gets encrypted).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (6b38a35) to head (1af195f).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1284   +/-   ##
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  Coverage     84.74%   84.74%           
  Complexity     1025     1025           
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  Files           174      174           
  Lines          3015     3015           
=========================================
  Hits           2555     2555           
  Misses          460      460           

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