[Rails 7] Remove annotate tests coercion

[mgrunberg]

Rails have made changes that make the coercion unnecessary

Before (https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/runs/4650448486?check_suite_focus=true):

7739 runs, 21027 assertions, 95 failures, 63 errors, 43 skips

After (https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/runs/4658531275?check_suite_focus=true)

7739 runs, 21027 assertions, 95 failures, 63 errors, 43 skips