Update google_network_services_authz_extension IAP example documentation

[ericlin0101]

This change updates the documentation for the 'google_network_services_authz_extension' resource by adding a 'metadata' block to the IAP example and enabling its generation.

Changes:

• Added 'metadata' block with 'iapPolicyVersion' to 'network_services_authz_extension_iap.tf.tmpl'.
• Enabled documentation for the IAP example in 'AuthzExtension.yaml' by removing 'skip_docs'.
• Synchronized missing 'AuthzExtension' resource definition and supporting templates.

[github-actions]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 9c69917:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	2 files changed, 6 insertions(+), 1 deletion(-)
google-beta provider	View Diff	2 files changed, 6 insertions(+), 1 deletion(-)
Open in Cloud Shell	View Diff	1 file changed, 3 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
101	95	5	1

Affected Service Packages

• networkservices

Learn how VCR tests work

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Step 1: Replaying Mode

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

• TestAccNetworkServicesAuthzExtension_networkServicesAuthzExtensionIapExample

View the replaying VCR build log

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Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccNetworkServicesAuthzExtension_networkServicesAuthzExtensionIapExample

🟢 All tests passed!

View the recording VCR build log or the debug logs folder for detailed results.

@ericlin0101, @roaks3 VCR tests complete for 9c69917!