chore(OsLogin): remove obsolete V1beta samples

[JoeWang1127]

OsLogin v1beta client code was removed in commit #7577 when promoting OsLogin to v2.

However, the legacy sample files in OsLogin/samples/V1beta/ were left orphaned in the repository. This change removes the obsolete samples.

[snippet-bot]

Here is the summary of changes.

You are about to delete 8 region tags.

• OsLogin/samples/V1beta/OsLoginServiceClient/create_ssh_public_key.php:25, tag oslogin_v1beta_generated_OsLoginService_CreateSshPublicKey_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/delete_posix_account.php:25, tag oslogin_v1beta_generated_OsLoginService_DeletePosixAccount_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/delete_ssh_public_key.php:25, tag oslogin_v1beta_generated_OsLoginService_DeleteSshPublicKey_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/get_login_profile.php:25, tag oslogin_v1beta_generated_OsLoginService_GetLoginProfile_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/get_ssh_public_key.php:25, tag oslogin_v1beta_generated_OsLoginService_GetSshPublicKey_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/import_ssh_public_key.php:25, tag oslogin_v1beta_generated_OsLoginService_ImportSshPublicKey_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/sign_ssh_public_key.php:25, tag oslogin_v1beta_generated_OsLoginService_SignSshPublicKey_sync
• OsLogin/samples/V1beta/OsLoginServiceClient/update_ssh_public_key.php:25, tag oslogin_v1beta_generated_OsLoginService_UpdateSshPublicKey_sync

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