ci/amd: Move manual/nightly jobs to postmerge stage

Create a new stage called amd-postmerge and move the full and manual
jobs over there, to avoid entanglement with the pre-merge jobs.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30784>

.gitlab-ci.yml

@@ -148,6 +148,7 @@ stages:
   - build-misc
   - code-validation
   - amd
+  - amd-postmerge
   - intel
   - nouveau
   - arm

src/amd/ci/gitlab-ci-inc.yml

@@ -43,7 +43,7 @@
       when: on_success
 
 .radv-manual-rules:
-  stage: amd
+  stage: amd-postmerge
   rules:
     - !reference [.test, rules]
     - !reference [.vulkan-manual-rules, rules]
@@ -76,7 +76,7 @@
     - !reference [.radv-rules, rules]
 
 .radv-valve-manual-rules:
-  stage: amd
+  stage: amd-postmerge
   extends: .no-auto-retry
   rules:
     - !reference [.test, rules]
@@ -101,7 +101,7 @@
       when: on_success
 
 .radeonsi-vaapi-manual-rules:
-  stage: amd
+  stage: amd-postmerge
   rules:
     - !reference [.test, rules]
     - !reference [.collabora-farm-manual-rules, rules]
@@ -118,7 +118,7 @@
     - !reference [.radeonsi-rules, rules]
 
 .radeonsi-valve-manual-rules:
-  stage: amd
+  stage: amd-postmerge
   rules:
     - !reference [.test, rules]
     - !reference [.valve-farm-manual-rules, rules]