API changes for skipped actions: patch actions and status_message

This patch implements the changes in the API required for the
skipped action blueprint. It includes:

- New field `status_message` is visible in API get calls for Audits,
  ActionPlans and Audits.
- New Patch call is added to `/actions/{action_id}` which allows to
  manually move actions in PENDING state to SKIPPED for ActionPlans
  which have not been started.
- A new API microversion 1.5 is added for these changes.

It also adds requried tests and documentation.

Implements: blueprint add-skip-actions

Assisted-By: Cursor (claude-4-sonnet)

Change-Id: I71fb9af76085e5941a7fd3e9e4c89d6f3a3ada47
Signed-off-by: Alfredo Moralejo <amoralej@redhat.com>

api-ref/source/parameters.yaml

@@ -189,6 +189,13 @@ action_state:
   in: body
   required: true
   type: string
+action_status_message:
+  description: |
+    Message with additional information about the Action state.
+  in: body
+  required: false
+  type: string
+  min_version: 1.5
 action_type:
   description: |
     Action type based on specific API action. Actions in Watcher are
@@ -230,6 +237,13 @@ actionplan_state:
   in: body
   required: false
   type: string
+actionplan_status_message:
+  description: |
+    Message with additional information about the Action Plan state.
+  in: body
+  required: false
+  type: string
+  min_version: 1.5
 
 # Audit
 audit_autotrigger:
@@ -320,6 +334,13 @@ audit_state:
   in: body
   required: true
   type: string
+audit_status_message:
+  description: |
+    Message with additional information about the Audit state.
+  in: body
+  required: false
+  type: string
+  min_version: 1.5
 audit_strategy:
   description: |
     The UUID or name of the Strategy.