feat: add ses smpt password to ssm, add ssm base path option

[Gowiem]

what

• Add option to change the SSM base path under which credentials are stored
• Store ses_smtp_password_v4 in SSM

why

• Even if the IAM users are global per account often times there is a need to separeate them per environment (dev, staging). By adding the ssm_base_path parameter we can have a better SSM hierarchy. Example: /dev/system_user/tc-dev-s3 and /staging/system_user/tc-staging-ses
• Also having the ses_smtp_password_v4 stored in SSM will allow better integration with CI systems when deploying applications (rather than having a script to generate the password or read the terraform state)

references

• Link to any supporting github issues or helpful documentation to add some context (e.g. stackoverflow).
• closes Add ses_smtp_password_v4 to SSM #60
• Copy of add ses smpt password to ssm, add ssm base path option #61, Closes add ses smpt password to ssm, add ssm base path option #61

[Gowiem]

/test all

[mergify]

This pull request is now in conflict. Could you fix it @Gowiem? 🙏

[nitrocode]

@Gowiem conflict

[Gowiem]

@nitrocode have you seen those auto-readme conflicts before? Not sure what is up there... I believe I want to accept all the incoming changes, but wanted to get another set of eyes before I undo some work if I'm wrong.

[Gowiem]

/test all

[Gowiem]

/test all