Revert "feat: add code sample and test for getting an access token from an im…"

[Sita04]

Reverts #1289
Tests aren't running for the sample as the CI hasn't been configured for it. These samples will potentially move to "java-docs-samples" repo.

[snippet-bot]

Here is the summary of changes.

You are about to delete 1 region tag.

• samples/snippets/src/main/java/AccessTokenFromImpersonatedCredentials.java:17, tag auth_cloud_accesstoken_impersonated_credentials

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[sonarqubecloud]

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