moved files from "update IAM policy samples to use GAPIC library" PR

[ssvir]

Description

moved files from "update IAM policy samples to use GAPIC library" PR to snippets module

Fixes #

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Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 8 region tags.

• iam/snippets/src/main/java/AddBinding.java:16, tag iam_modify_policy_add_role
• iam/snippets/src/main/java/AddMember.java:16, tag iam_modify_policy_add_member
• iam/snippets/src/main/java/GetProjectPolicy.java:16, tag iam_get_policy
• iam/snippets/src/main/java/GetServiceAccountPolicy.java:16, tag iam_service_account_get_policy
• iam/snippets/src/main/java/Quickstart.java:16, tag iam_quickstart
• iam/snippets/src/main/java/RemoveMember.java:16, tag iam_modify_policy_remove_member
• iam/snippets/src/main/java/SetProjectPolicy.java:16, tag iam_set_policy
• iam/snippets/src/main/java/SetServiceAccountPolicy.java:16, tag iam_service_account_set_policy

You are about to delete 8 region tags.

• iam/api-client/src/main/java/iam/snippets/AddBinding.java:18, tag iam_modify_policy_add_role
• iam/api-client/src/main/java/iam/snippets/AddMember.java:18, tag iam_modify_policy_add_member
• iam/api-client/src/main/java/iam/snippets/GetProjectPolicy.java:18, tag iam_get_policy
• iam/api-client/src/main/java/iam/snippets/GetServiceAccountPolicy.java:18, tag iam_service_account_get_policy
• iam/api-client/src/main/java/iam/snippets/Quickstart.java:18, tag iam_quickstart
• iam/api-client/src/main/java/iam/snippets/RemoveMember.java:18, tag iam_modify_policy_remove_member
• iam/api-client/src/main/java/iam/snippets/SetProjectPolicy.java:18, tag iam_set_policy
• iam/api-client/src/main/java/iam/snippets/SetServiceAccountPolicy.java:18, tag iam_service_account_set_policy

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