feat: add yaml tag support and bump to golang 1.22

[tuunit]

Motivation and Context

I want to get rid of the wrapper github.com/ghodss/yaml dependency for the upstream gopkg.in/yaml package inside oauth2-proxy.

I quote:

In short, this library first converts YAML to JSON using go-yaml and then uses json.Marshal and json.Unmarshal to convert to or from the struct. This means that it effectively reuses the JSON struct tags as well as the custom JSON methods MarshalJSON and UnmarshalJSON unlike go-yaml. For a detailed overview of the rationale behind this method

How Has This Been Tested?

• Extended the unit tests for json & yaml tags
• Made sure old json tests still work
• Made sure new yaml tests work as well

[JoelSpeed]

LGTM