apigee: fix TestAccApigeeInstance_apigeeInstanceServiceAttachmentBasicTestExample

[SirGitsalot]

Fixes nightly acceptance test failure for TestAccApigeeInstance_apigeeInstanceServiceAttachmentBasicTestExample.

Root Cause & Fix

The test previously failed with a 404 Not Found error because it referenced the non-existent "default" network and subnetwork for the PSC ILB consumer.

The fix explicitly provisions a dedicated google_compute_network (with auto_create_subnetworks = false) and google_compute_subnetwork for the psc_ilb consumer resources.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 5a41b7e:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	1 file changed, 20 insertions(+), 2 deletions(-)
google-beta provider	View Diff	1 file changed, 20 insertions(+), 2 deletions(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
85	42	43	0

Affected Service Packages

• apigee

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