Re-record StandbyPool playback tests after Compute dependency release

[ArcturusZhang]

The StandbyPool playback test(s) that create Network/Compute dependencies need to be re-recorded after the next Azure.ResourceManager.Compute release.

Context:

• In [Mgmt] Azure.ResourceManager.Compute: Migrate to TypeSpec #57019, the Compute SDK is migrated to the new generator.
• StandbyPool tests run in project-reference mode against the changed Compute project.
• The CI failure in build 6452072 occurs in Ubuntu2404_NET90_ProjectRef_Release_ib1 while running StandbyPool tests.
• Playback cannot find the recorded Network VNet creation request used by ListStandbyVirtualMachinePoolByResourcGroup().
• These tests should be re-recorded once Compute is released and StandbyPool can consume the released package instead of project-reference bits.

Affected test:

• sdk/standbypool/Azure.ResourceManager.StandbyPool/tests/Scenario/StandbyVirtualMachinePoolCollectionTests.cs
• ListStandbyVirtualMachinePoolByResourcGroup