Handle missing openpath ids

[robz]

When OP accounts are created by the script, it sets a openpathid field on the corresponding neon account, so that it's easy to quickly update the OP account in the future.

If the OP account is manually created, or if the script fails to write the openpathid field back, the openpathid field can be missing. This causes the script to fail, since it'll attempt to recreated the OP account and encounter a 400 error.

Instead, detect these cases ahead of time by using the reverse edge (the external_id field on OP accounts is set to the neon account). Then write the OP account id back to the neon account again.

Also:

• log the entire message when receiving 400s from openpath, so it's faster to debug failures in the future
• skip attempting to make other mutations after receiving a 400
• make openPathUpdateAll less verbose and clean up dead code, which make this harder to debug

[vlarie]

Thank you for quickly addressing this and leaving a thorough and concise description for the record here