Bug/msp 11049/deprecation log

[MSP-11049](https://jira.tor.rapid7.com/browse/MSP-11049)

Set `config.active_support.deprecation` to `:log` so that deprecation warnings are logged.

# Verification Steps

- [ ] `./msfconsole --environment development`
- [ ] VERIFY the warning that `config.active_support.deprecation` is not set is NOT shown: ```
You did not specify how you would like Rails to report deprecation notices for your development environment,
please set config.active_support.deprecation to :log at config/environments/development.rb
```
- [ ] `irb`
- [ ] `ActiveSupport::Deprecation.warn("Deprecation warning from msfconsole irb")
- [ ] `exit`
- [ ] VERIFY the deprecation warning was logged: `grep "Deprecation warning from msfconsole irb" log/development.log` should print `DEPRECATION WARNING: Deprecation warning from msfconsole irb. (called from cmd_irb at (irb):1)`