CI: troubleshoot codecov
The results here https://codecov.io/gh/pandas-dev/pandas/tree/master/pandas are 17 days old, the last attempt to re-enable codecov apparently didn't take.  Trying again.
Do we have any way (other than merging) to tell if this will actually accomplish the goal of getting codecov updated? Any objections to the "merge this and see if it works" style of debugging here? @WillAyd gentle ping @thomasrockhu any ideas what we're doing wrong here?  pandas codecov page stopped updating about a month ago @jbrockmendel taking a look now! thanks for bringing this to our attention @jbrockmendel looks like it's a problem with how `$TYPE` is getting set (or that it's not getting set). As an example, right now the call to Codecov is

```
bash <(curl -s https://codecov.io/bash) -Z -c -F  -f /tmp/test_coverage.xml -C b4343efa33c9456694bcfd6dee7bf5941288966b
```

Since the flags `-F` flag is empty, it's pulling `-f` as the value. Let me know if this helps! @thomasrockhu  Thanks for the quick feeedback.  It looks like the TYPE variable stopped getting defined in #28531, so im going to just remove that and see if it does the trick.