tests: remove single-platform image

Not sure what they are testing, but they prevent us from running e2e
tests on other architectures, and they are already covered by
unit-tests and multi-arch images tests just above.

Signed-off-by: Vincent Demeester <[email protected]>

Author: vdemeester

examples/v1/taskruns/entrypoint-resolution.yaml

@@ -26,24 +26,3 @@ spec:
     - image: mirror.gcr.io/ubuntu
       command: ['sh', '-c']
       args: ['echo hello']
-
-    # Single-platform image with no command defined. We should look up the one
-    # and only command value and pass it to the Pod.
-    - image: docker.io/amd64/ubuntu
-
-    # Single-platform image with no command defined, but with args. We'll look
-    # up the one command and pass it to the entrypoint binary, then append the
-    # specified args.
-    - image: docker.io/amd64/ubuntu
-      args: ['-c', 'echo', 'hello']
-
-    # Single-platform image, but since we specify `script` we don't need to
-    # look it up and pass it down.
-    - image: docker.io/amd64/ubuntu
-      script: echo hello
-
-    # Single-platform image, but since we specify `command` and `args` we
-    # don't need to look it up and pass it down.
-    - image: docker.io/amd64/ubuntu
-      command: ['sh', '-c']
-      args: ['echo hello']