fix(#4373): remove legacy postgres initializer

[elasticspoon]

Fixes #4373

Application had a legacy hack to forcefully drop DB connections that was needed with pow.cx.

That is no longer used and the hack no longer work with Rails 7.1 so the initializer can be removed.

Can confirm it happens on main for me without the fix:

$ > rails db:reset
undefined local variable or method `establish_master_connection' for #<ActiveRecord::Tasks::PostgreSQLDatabaseTasks:0x00007f1e4e8619b0 @db_config=#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007f1e4ee59930 @env_name="development", @name="primary", @configuration_hash={:adapter=>"postgresql", :encoding=>"unicode", :host=>"localhost", :database=>"diaper_dev", :username=>"postgres", :password=>"postgres", :pool=>5, :timeout=>5000}>, @configuration_hash={:adapter=>"postgresql", :encoding=>"unicode", :host=>"localhost", :database=>"diaper_dev", :username=>"postgres", :password=>"postgres", :pool=>5, :timeout=>5000}>
Couldn't drop database 'diaper_dev'
bin/rails aborted!
NameError: undefined local variable or method `establish_master_connection' for #<ActiveRecord::Tasks::PostgreSQLDatabaseTasks:0x00007f1e4e8619b0 @db_config=#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007f1e4ee59930 @env_name="development", @name="primary", @configuration_hash={:adapter=>"postgresql", :encoding=>"unicode", :host=>"localhost", :database=>"diaper_dev", :username=>"postgres", :password=>"postgres", :pool=>5, :timeout=>5000}>, @configuration_hash={:adapter=>"postgresql", :encoding=>"unicode", :host=>"localhost", :database=>"diaper_dev", :username=>"postgres", :password=>"postgres", :pool=>5, :timeout=>5000}> (NameError)

          establish_master_connection
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Did you mean?  establish_connection
/home/bandito/Projects/rfg-human-essentials-fork/config/initializers/postgres.rb:7:in `drop'
Tasks: TOP => db:drop:_unsafe
(See full trace by running task with --trace)

and works fine with the fix:

$ > rails db:reset
Dropped database 'diaper_dev'
Dropped database 'diaper_test'
Created database 'diaper_dev'
Created database 'diaper_test'
loading US counties and equivalents.

[dorner]

Thanks!

[github-actions[bot]]

@elasticspoon: Your PR fix(#4373): remove legacy postgres initializer is part of today's Human Essentials production release: 2024.05.26. Thank you very much for your contribution!