[MetricsAdvisor] Regenerate code from latest swagger

[kinelski]

Part of #21177.

A bunch of internal renames and internal code changes since some properties are not marked as required anymore. We also removed the enum value DataFeedGranularityType.PerSecond because the service does not support it anymore.

We could also remove one of our swagger transforms.

[maririos]

We could also remove one of our swagger transforms.

Do you mean the credential one?

Not related to your PR:

• With the pagination work you did in a previous PR, do you still need the pagination transforms?
• Any change the service can add the required properties to their swagger instead of having so many transofrms?

[kinelski]

We could also remove one of our swagger transforms.

Do you mean the credential one?

Correct. We removed the credential transform.

Not related to your PR:

* With the pagination work you did in a previous PR, do you still need the pagination transforms?

The pagination work I did is not related to the transforms we have in the swagger. That was due to a service-side change.

* Any change the service can add the required properties to their swagger instead of having so many transofrms?

Some of them may already be fixed on the swagger-side, but I need to double check. I will bring the discussion up with Johan, but I wouldn't say this is high priority right now. The service is a bit busy with GA, and changing a property from non-required => required in the swagger would not be a breaking change, so we can always fix it later if we can convince them.