chore: remove native image sample in favor of sample hosted in google…

…-cloud-java (#2105)

* chore: remove native image sample in favor of sample hosted in google-cloud-java

README.md

@@ -242,8 +242,6 @@ Samples are in the [`samples/`](https://github.com/googleapis/java-pubsub/tree/m
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
-| Native Image Pub Sub Sample | [source code](https://github.com/googleapis/java-pubsub/blob/main/samples/native-image-sample/src/main/java/pubsub/NativeImagePubSubSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsub&page=editor&open_in_editor=samples/native-image-sample/src/main/java/pubsub/NativeImagePubSubSample.java) |
-| Publish Operations | [source code](https://github.com/googleapis/java-pubsub/blob/main/samples/native-image-sample/src/main/java/utilities/PublishOperations.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsub&page=editor&open_in_editor=samples/native-image-sample/src/main/java/utilities/PublishOperations.java) |
 | Commit Avro Schema Example | [source code](https://github.com/googleapis/java-pubsub/blob/main/samples/snippets/src/main/java/pubsub/CommitAvroSchemaExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsub&page=editor&open_in_editor=samples/snippets/src/main/java/pubsub/CommitAvroSchemaExample.java) |
 | Commit Proto Schema Example | [source code](https://github.com/googleapis/java-pubsub/blob/main/samples/snippets/src/main/java/pubsub/CommitProtoSchemaExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsub&page=editor&open_in_editor=samples/snippets/src/main/java/pubsub/CommitProtoSchemaExample.java) |
 | Create Avro Schema Example | [source code](https://github.com/googleapis/java-pubsub/blob/main/samples/snippets/src/main/java/pubsub/CreateAvroSchemaExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsub&page=editor&open_in_editor=samples/snippets/src/main/java/pubsub/CreateAvroSchemaExample.java) |