Update the repository config in spring cloud azure pom files

[moarychan]

• Add a sparse-checkout path
• Remove unnecessary repository config in each spring project when it depends on azure-client-sdk-parent.
• When not dependent on azure-client-sdk-parent, configure spring milestone repo for spring cloud azure starter.

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[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

spring-cloud-azure-core spring-messaging-azure-eventhubs spring-messaging-azure-servicebus spring-cloud-azure-autoconfigure

[moarychan]

@saragluna please help to review, thanks!