Fix storagetransfer transferoptions perm diff

[yudoufu]

Fix #11744

There was a issue with transferOptions always returning from API when using posix,
I think This fix added, probably.
but it had too large effect to other cases.
So I fixed to use only posix case.

If this PR is for Terraform, I acknowledge that I have:

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• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
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• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

storagetransfer: fixed perm diff on transfer_options for `google_storage_transfer_job`

[modular-magician]

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 135 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 2 files changed, 135 insertions(+), 4 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2023
Passed tests 1796
Skipped tests: 226
Failed tests: 1

Action taken

Triggering VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccStorageTransferJob_transfreOptions

[modular-magician]

Tests passed during RECORDING mode:
TestAccStorageTransferJob_transfreOptions[view]

All tests passed
View the build log or the debug log for each test

[ScottSuarez]

@slevenick could you take a look here. Looks like you authored a PR referenced here and might have more context for a review

[yudoufu]

@slevenick Could you please take a look this PR?

[slevenick]

Looks fine other than a typo in the test name

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 135 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 2 files changed, 135 insertions(+), 4 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2032
Passed tests 1792
Skipped tests: 226
Failed tests: 14

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccStorageTransferJob_transferOptions|TestAccFirebaserulesRelease_BasicRelease|TestAccContainerCluster_withReleaseChannelEnabledDefaultVersion|TestAccContainerCluster_nodeAutoprovisioningDefaultsImageType|TestAccContainerCluster_withWorkloadMetadataConfig|TestAccContainerCluster_withConfidentialNodes|TestAccContainerCluster_withSandboxConfig|TestAccContainerCluster_updateVersion|TestAccContainerCluster_withNotificationConfig|TestAccContainerCluster_withVersion|TestAccContainerCluster_withBootDiskKmsKey|TestAccContainerCluster_withAddons|TestAccContainerCluster_nodeAutoprovisioningDefaults|TestAccComputeSecurityPolicy_withAdvancedOptionsConfig

[modular-magician]

Tests passed during RECORDING mode:
TestAccComputeSecurityPolicy_withAdvancedOptionsConfig[view]
TestAccContainerCluster_withSandboxConfig[view]
TestAccStorageTransferJob_transferOptions[view]
TestAccFirebaserulesRelease_BasicRelease[view]
TestAccContainerCluster_nodeAutoprovisioningDefaultsImageType[view]
TestAccContainerCluster_nodeAutoprovisioningDefaultsMinCpuPlatform[view]
TestAccContainerCluster_nodeAutoprovisioningDefaults[view]
TestAccContainerCluster_withBootDiskKmsKey[view]
TestAccContainerCluster_withReleaseChannelEnabledDefaultVersion[view]
TestAccContainerCluster_withWorkloadMetadataConfig[view]
TestAccContainerCluster_updateVersion[view]
TestAccContainerCluster_withVersion[view]

Tests failed during RECORDING mode:
TestAccContainerCluster_withNotificationConfig[view]
TestAccContainerCluster_withConfidentialNodes[view]
TestAccContainerCluster_withAddons[view]

Please fix these to complete your PR
View the build log or the debug log for each test