chore: remove migrated samples

[Sita04]

Delete samples migrated in PR: GoogleCloudPlatform/java-docs-samples#7419

Doc references have been updated in CL 507832015

[snippet-bot]

Here is the summary of possible violations 😱

There are 5 possible violations for removing region tag in use.

• samples/cloud-client/snippets/src/main/java/CreateDenyPolicy.java:17, tag iam_create_deny_policy(usage: page 1).
• samples/cloud-client/snippets/src/main/java/DeleteDenyPolicy.java:17, tag iam_delete_deny_policy(usage: page 1).
• samples/cloud-client/snippets/src/main/java/GetDenyPolicy.java:17, tag iam_get_deny_policy(usage: page 1).
• samples/cloud-client/snippets/src/main/java/ListDenyPolicies.java:17, tag iam_list_deny_policy(usage: page 1).
• samples/cloud-client/snippets/src/main/java/UpdateDenyPolicy.java:17, tag iam_update_deny_policy(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to delete 5 region tags.

• samples/cloud-client/snippets/src/main/java/CreateDenyPolicy.java:17, tag iam_create_deny_policy
• samples/cloud-client/snippets/src/main/java/DeleteDenyPolicy.java:17, tag iam_delete_deny_policy
• samples/cloud-client/snippets/src/main/java/GetDenyPolicy.java:17, tag iam_get_deny_policy
• samples/cloud-client/snippets/src/main/java/ListDenyPolicies.java:17, tag iam_list_deny_policy
• samples/cloud-client/snippets/src/main/java/UpdateDenyPolicy.java:17, tag iam_update_deny_policy

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[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
https://conventionalcommits.org/