stages: source stage (#8330)

* stages: source stage

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* include stage name in dummy stage

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* use data instead of instance for login button

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* make mostly work

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix ident stage

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* make it work

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* pass more data

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix flow inspector not always loading

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix dark theme for stepper

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix inspector styling

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* don't skip source stage unless returning

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* auto open flow inspector when debug

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix lint

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fixup

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix lint

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix validation

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* include raw saml response in flow context

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add some tests

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* move

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add docs

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* Apply suggestions from code review

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Jens L. <jens@beryju.org>

* fix import

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Signed-off-by: Jens L. <jens@beryju.org>
Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>

website/docs/core/terminology.md

@@ -53,6 +53,10 @@ Flows are an ordered sequence of stages. These flows can be used to define how a
 
 A stage represents a single verification or logic step. They are used to authenticate users, enroll users, and more. These stages can optionally be applied to a flow via policies.
 
+#### Dynamic in-memory stage
+
+Certain use cases within authentik add steps that are run as part of a flow. These steps are a special type of stage called the "Dynamic in-memory" stage, as they are added to flows dynamically when required, only exist in memory, and are thus not configurable by administrators.
+
 See [Flows](../flow/index.md)
 
 ### Property Mappings