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

[mpeddada1]

This PR removes the redundant, library-specific bigtable native image sample in favor of a single sample maintained in https://github.com/googleapis/google-cloud-java/tree/main/java-samples/native-image-sample

Documented externally in https://cloud.google.com/java/docs/compile-native-images#whats_next

[snippet-bot]

Here is the summary of changes.

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• samples/native-image-sample/pom.xml:26, tag bigtable_install_with_bom

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[generated-files-bot]

Warning: This pull request is touching the following templated files:

• samples/pom.xml