fix: Fix yaml validation for key named "type"

[suejung-sentry]

The cerberus library that we use for yaml validation has a bug when a schema field is named "type," a reserved word (see similar unresolved bug report in their repo here).
This results in codecov yaml validator returns 500 internal server error instead of a more specific validation error if you accidentally pass an object instead of a list under flag_management and component_management(as was reported here).

Aside from waiting for the underlying library to fix the issue (or vendoring the library and fixing it in our own copy), it seems we can use a workaround with the anyof union type offered by the library.
When declaring the schema type is anyof with a single element describing the expected shape, we can get around the problem, as done in this PR.

So now it will return error must be of list type instead of original error none is not iterable which happens when you try to iterate over none at here

    def _normalize_rename(self, mapping, schema, field):
        """{'type': 'hashable'}"""
        print("schema[field]", schema[field])
        print("field", field)
        if 'rename' in schema[field]:
            mapping[schema[field]['rename']] = mapping[field]
            del mapping[field]

So that will give a richer error message for this edge case of schema fields named "type", and expecting a list instead of an object.

Note that the error message for extraneous subfields becomes slightly different with "unknown field" instead of "extra keys not allowed" (see updated test)

Closes codecov/feedback#146

[codspeed-hq]

CodSpeed Performance Report

Merging #588 will not alter performance

_{Comparing sshin/fix/yaml-validation (1c27a0b) with main (ae1d4cf)}

Summary

✅ 9 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.59%. Comparing base (0478220) to head (1c27a0b).
Report is 13 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #588      +/-   ##
==========================================
- Coverage   88.62%   88.59%   -0.04%     
==========================================
  Files         462      463       +1     
  Lines       12875    12786      -89     
  Branches     1461     1458       -3     
==========================================
- Hits        11411    11328      -83     
+ Misses       1159     1153       -6     
  Partials      305      305              

Flag	Coverage Δ
shared-docker-uploader	88.59% <ø> (-0.04%)	⬇️

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Codecov Report

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[ajay-sentry]

very cool! I wish the wording of the message was of format must be of type list rather than must be of list type but thats outside of our control seems like :(

Thanks for documenting this thoroughly!