[AlertsManagement] update SDK with API version 2021-08-08

[inballeibovitch]

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[inballeibovitch]

Link to swagger PR that contains the spec changes-
Azure/azure-rest-api-specs#17162

[archerzz]

This looks like a major upgrade with breaking changes. If this is the first official release, can we make the version number 1.0.0.0?

Note that for breaking changes, it's recommended:

• either provide backward compatibility through customization
• or bump the major version number, e.g. 1.x.x.x to 2.0.0.0

Since the backend API version is switched from preview to stable, it's recommended to bump the major version number.