First class test support for spring-security-oauth2-client

[rwinch]

Summary

We should add first-class test support for the spring-security-oauth2-client module

• Add oidcLogin MockMvc Test Support #7618 - Add OIDC Login MockMvc Test Support
• Add Oidc Login Reactive Test Support #7680 - Add OIDC Login Reactive Test Support
• Add oauth2Login MockMvc Test Support #7789 - Add OAuth 2.0 Login MockMvc Test Support
• Add oauth2Login Reactive Test support #7828 - Add OAuth 2.0 Login Reactive Test Support
• Add oauth2Client MockMvc Test Support  #7886 - Add OAuth 2.0 Client MockMvc Test Support
• Add oauth2Client WebTestClient Test Support  #7910 - Add OAuth 2.0 Client Reactive Test Support

[ch4mpy]

I may have the beginning of solution.
More details

[elch78]

Added another ticket that also relates to test support #7624