Unable to add MongoDB service due to + in the password

Impact on the user
Forces restrictions on password complexity

Steps to reproduce

• Create MongoDB user for PMM with a + in the password
• Use pmm-admin to add the service

Actual result

Connection check failed: connection() error occured during connection handshake: auth error: unable to authenticate using mechanism "SCRAM-SHA-256": (AuthenticationFailed) Authentication failed..

Expected Result

MongoDB Service added.

Workaround
Remove + from the password

Details
It is not possible to add MongoDB to PMM when the password contains +.
This does not affect either MySQL nor PostgreSQL.