chore: remove native image sample in favor of sample hosted in google-cloud-java (#2273)

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

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: mpeddada1

README.md

@@ -420,7 +420,6 @@ Samples are in the [`samples/`](https://github.com/googleapis/java-bigtable/tree
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
-| Native Image Bigtable Sample | [source code](https://github.com/googleapis/java-bigtable/blob/main/samples/native-image-sample/src/main/java/com/example/bigtable/NativeImageBigtableSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigtable&page=editor&open_in_editor=samples/native-image-sample/src/main/java/com/example/bigtable/NativeImageBigtableSample.java) |
 | Authorized View Example | [source code](https://github.com/googleapis/java-bigtable/blob/main/samples/snippets/src/main/java/com/example/bigtable/AuthorizedViewExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigtable&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigtable/AuthorizedViewExample.java) |
 | Configure Connection Pool | [source code](https://github.com/googleapis/java-bigtable/blob/main/samples/snippets/src/main/java/com/example/bigtable/ConfigureConnectionPool.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigtable&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigtable/ConfigureConnectionPool.java) |
 | Filters | [source code](https://github.com/googleapis/java-bigtable/blob/main/samples/snippets/src/main/java/com/example/bigtable/Filters.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigtable&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigtable/Filters.java) |