[CI] Soft-fail AMD entrypoints mirror tests (#43709)

Signed-off-by: Kevin Luu <kevin@inferact.ai>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.buildkite/test_areas/entrypoints.yaml

@@ -29,6 +29,7 @@ steps:
   mirror:
     amd:
       device: mi300_1
+      soft_fail: true
       depends_on:
       - image-build-amd
 
@@ -46,6 +47,7 @@ steps:
   mirror:
     amd:
       device: mi300_1
+      soft_fail: true
       timeout_in_minutes: 80
       depends_on:
       - image-build-amd
@@ -64,6 +66,7 @@ steps:
   mirror:
     amd:
       device: mi300_1
+      soft_fail: true
       timeout_in_minutes: 60
       depends_on:
       - image-build-amd
@@ -83,6 +86,7 @@ steps:
   mirror:
     amd:
       device: mi300_1
+      soft_fail: true
       timeout_in_minutes: 60
       depends_on:
       - image-build-amd
@@ -105,6 +109,7 @@ steps:
   mirror:
     amd:
       device: mi300_1
+      soft_fail: true
       depends_on:
       - image-build-amd