SupportBundles: Add OAuth bundle collectors (#64810)

* wip

* add oauth support bundles

* add specific configs for generic oauth and azureAD

* add doc entry

* optimize struct packing

* Update pkg/login/social/azuread_oauth.go

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

* nit update

---------

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

docs/sources/troubleshooting/support-bundles/index.md

@@ -31,6 +31,7 @@ A support bundle can include any of the following components:
 - **Settings**: Settings for the Grafana instance
 - **SAML**: Healthcheck connection and metadata for SAML (only displayed if SAML is enabled)
 - **LDAP**: Healthcheck connection and metadata for LDAP (only displayed if LDAP is enabled)
+- **OAuth2**: Healthcheck connection and metadata for each OAuth2 Provider supporter (only displayed if OAuth provider is enabled)
 
 ## Steps