Okta OAuth provider (team sync support) (#22972)

* Okta OAuth support

* Chore: fix linter error

* Chore: move IsEmailAllowed to SocialBase

* Chore: move IsSignupAllowed to SocialBase

* Chore: review fixes

* Okta: support allowed_groups

* Okta: default config

* Chore: move extractEmail() to OktaClaims struct

* Chore: review fixes

* generic_oauth_test: Handle error cases

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* generic_oauth_test: Handle error cases

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Docs: Okta OAuth

* Chore: don't return expected errors from searchJSONForAttr

* Docs: role mapping

* Chore: review fixes (searchJSONForAttr)

* Docs: review fixes

* Update docs/sources/auth/okta.md

Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>

* Update docs/sources/auth/okta.md

Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>

* Chore: log error if searchJSONForAttr failed

* Docs: add Okta login link

* Docs: review fixes

* Docs: add reference to the org roles

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/models/models.go

@@ -10,4 +10,5 @@ const (
 	GRAFANA_COM
 	GITLAB
 	AZUREAD
+	OKTA
 )