remove network url custom expand for workbench instance

[bcreddy-gcp]

fixes hashicorp/terraform-provider-google#17904

Release Note Template for Downstream PRs (will be copied)

workbench: fixed a bug in the `google_workbench_instance` resource where specifying a network in some scenarios would cause instance creation to fail

[github-actions]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 1 insertion(+), 10 deletions(-))
google-beta provider: Diff ( 1 file changed, 1 insertion(+), 10 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 1 insertion(+), 10 deletions(-))

[modular-magician]

Tests analytics

Total tests: 16
Passed tests: 15
Skipped tests: 0
Affected tests: 1

Click here to see the affected service packages

• workbench

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccWorkbenchInstance_workbenchInstanceFullExample

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[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccWorkbenchInstance_workbenchInstanceFullExample[Debug log]

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

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$\textcolor{green}{\textsf{All tests passed!}}$
View the build log or the debug log for each test