feature request: `config test` command should return more helpful logs

I’m not sure what options are available but this is related to a slack thread https://meltano.slack.com/archives/CMN8HELB0/p1670907167441139 where meltano config tap-google-analytics test was failing and it was hard to figure out what was wrong.

In this case the view_id was expected to be a string but was being passed in as an integer. The error message just says Plugin configuration is invalid with no other context. Eventually we ran the tap with invoke and it showed log messages that explained the misconfiguration singer_sdk.exceptions.ConfigValidationError: Config validation failed: <number> is not of type 'string'. I also got the same generic Plugin configuration is invalid message when testing a purposefully wrong client secret.

Potentially Helpful Ideas:

1. Try to re-log the exception. Maybe we can say exactly what part of the json schema didnt pass validation or if the tap is executed we can re-log the exception (although I know thats tricky).
2. Add a log to the config/test error output about what it means. I.e. “Plugin configuration is invalid. This could be related to a schema violation or because the tap was unable to connect to the source system with provided configs.” 🤷
3. Add a suggestion to try using invoke to see if the tap returns a helpful log about whats misconfigured
4. The hub tells users to run config/test. Maybe it should also have a note to try running invoke.

cc @menzenski

[aaronsteers]

Following from the roadmap outlined here:

• #6642

I’ve logged the ‘first step’ here:

• https://github.com/meltano/meltano/issues/7081

If that is built, then:

1. The Singer logs would be logged into a file during discovery.
2. If the task fails, we’d print the path to the log file, which you could open and view logs.
3. Logs would describe the validation error.

[menzenski]

It’s perhaps worth noting that if the --log-level=debug parameter is passed (meltano --log-level=debug config tap-google-analytics test), the same clear error message is written to the logs but it’s effectively buried in many other log messages.

2022-12-13T15:41:55.328190Z [debug    ] File "/Users/matt/dev/pudl/src/.meltano/extractors/tap-google-analytics/venv/lib/python3.9/site-packages/singer_sdk/plugin_base.py", line 257, in _validate_config
2022-12-13T15:41:55.328302Z [debug    ] raise ConfigValidationError(summary)
2022-12-13T15:41:55.328374Z [debug    ] singer_sdk.exceptions.ConfigValidationError: Config validation failed: XXXXXXXXX is not of type 'string'
2022-12-13T15:41:55.328452Z [debug    ] JSONSchema was: {'type': 'object', 'properties': {'start_date': {'type': ['string'], 'format': 'date-time', 'description': 'The earliest record date to sync'}, 'view_id': {'type': ['string'], 'description': 'Google Analytics View ID'}, 'client_secrets': {'type': ['object', 'null'], 'properties': {}, 'description': 'Google Analytics Client Secrets Dictionary'}, 'key_file_location': {'type': ['string', 'null'], 'description': 'File Path to Google Analytics Client Secrets'}, 'oauth_credentials': {'type': ['object', 'null'], 'properties': {'access_token': {'type': ['string', 'null'], 'description': 'Google Analytics Access Token'}, 'refresh_token': {'type': ['string', 'null'], 'description': 'Google Analytics Refresh Token'}, 'client_id': {'type': ['string', 'null'], 'description': 'Google Analytics Client ID'}, 'client_secret': {'type': ['string', 'null'], 'description': 'Google Analytics Client Secret'}}, 'description': 'Google Analytics OAuth Credentials'}, 'reports': {'type': ['string', 'null'], 'description': 'Google Analytics Reports Definition'}, 'end_date': {'type': ['string', 'null'], 'description': 'The last record date to sync'}, 'stream_maps': {'type': ['object', 'null'], 'properties': {}, 'description': 'Config object for stream maps capability. For more information check out [Stream Maps](https://sdk.meltano.com/en/latest/stream_maps.html).'}, 'stream_map_config': {'type': ['object', 'null'], 'properties': {}, 'description': 'User-defined config values to be used within map expressions.'}, 'flattening_enabled': {'type': ['boolean', 'null'], 'description': "'True' to enable schema flattening and automatically expand nested properties."}, 'flattening_max_depth': {'type': ['integer', 'null'], 'description': 'The max depth to flatten schemas.'}}, 'required': ['start_date', 'view_id']}
2022-12-13T15:41:55.414234Z [debug    ] Deleted configuration at /Users/matt/dev/pudl/src/.meltano/run/tap-google-analytics/tap.b8c6ff32-c496-4377-a255-ee76580171dd.config.json
2022-12-13T15:41:55.415769Z [debug    ] Need help fixing this problem? Visit http://melta.no/ for troubleshooting steps, or to