test(azure): stub server pagers in Azure SQL converter tests

[cristim]

Closes #184

Three converter tests (PopulatesAllFields, PopulatesEngineVersion, CapabilitiesErrorFallsBack) stubbed only capabilities. convertAzureSQLRecommendation reaches fetchServerInfo, which built default ARM pagers and issued real GETs to management.azure.com (a 400 InvalidSubscriptionId came back in the test log).

Fix: inject empty managed-instance and server pagers in those three tests.

Verification: before, go test -short -v on the package logged 3 management.azure.com requests; after, 0. Removing the pagers from one test again produced 1. No loud-failure guard added: the package has no existing network-denial pattern and the issue's suggested one would be a new abstraction.

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📒 Files selected for processing (2)

• providers/azure/services/database/client_test.go
• providers/azure/services/database/network_guard_test.go

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