bug: syncGroups does error printing, but not slog

[palfrey]

Describe the bug
During slogGroups, various errors can occur (e.g. Error: cannot create google service: google: error getting JWT config from Service Account: invalid character '.' looking for beginning of value) which get dumped to console, but not handed through slog, which makes determining their error level in a lambda hard as they just show up as info level.

To Reproduce
Steps to reproduce the behavior:

1. Have a broken config
2. Run idpscim in a lambda

Expected behavior
slog.Error call so we get properly tagged error logs

Additional information
Would a PR that added slog.Error bits to those be wanted?

[palfrey]

@christiangda ?

[christiangda]

Thank you very much @palfrey for reporting this issue, I fixed this on PR #338