further work on phone number validation

[terrazoon]

Description

1. checking if the phone number was in SIMULATED_SMS_NUMBERS failed, because recipient is not stored with a + sign, but SIMULATED_SMS_NUMBERS has plus signs. Fix that.
2. add more debug statements so we know more easily if it worked or not.
3. Remove an unrelated debug statement in s3.py that got checked in somehow. It is harmless in terms of PII but leads to huge amounts of logging.

Currently this can only be tested on staging, as only staging (theoretically) has pinpoint permissions. Testing on local will give an 'access denied'.

Security Considerations

N/A

[ccostino]

Thanks, @terrazoon!

[A-Shumway42]

Looks good to me.