Add more packager checks for OAuth config

[pvanderknyff]

Added the following checks:

• If there is a default config ID defined with a default config ID (ie not a missing id), check that it is lowercase.
• If there are any config ids, check that there is a default config (either explicitly defined or inferred by no ID)
• Check that there are no duplicate IDs. This check fails if we have both default and missing ID

Connectors with no embedded configs will not be affected.

The checks all fail because of an issue with the test framework we are using being deprecated. Have a followup story to address this but until then have confirmed all tests pass locally.