codecov.yml: switch to informational mode

Informational mode should always produce "pass" result:
https://docs.codecov.io/docs/commit-status#informational

I can't get anything useful of these notifications.
E.g. now we have patches that add 1 line,
which gives 0% patch coverage, which results in a failure.
But we have some packages/commands not tested at all,
so we can't require contributors to make that covered.

For overall project coverage I also have not seen
any useful pass/fail results. The criteria highly depends
on the nature of the change. If we set the threshold too low,
we will get lots of effectively false failures. The current 50%
setting effectively means "never fail" anyway.

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