Uses check_all_pending! instead of check_pending! per ActiveRecord re…

[broosk1993]

Uses check_all_pending! instead of check_pending! per ActiveRecord recommendation.

ActiveRecord now shows a warning that check_all_pending! should be used.

[sharz1]

Also running into this warning with rails 7 upgrade. Can this be merged as part of #123 resolution?

[c960657]

I suspect that calling check_all_pending! will cause random errors as those reported here:

• https://stackoverflow.com/questions/73109620/getting-intermittent-error-of-no-connection-pool-for-activerecordbase-found
• https://stackoverflow.com/questions/66774339/activerecordconnectionnotestablished-randomly-occured-in-deployed-instance-aft/66928112

The problem is hard to reproduce, but it seem to have gone away after I moved from the solution suggested here to calling ActiveRecord::Base.connection.migration_context.needs_migration? directly.