bug(Cloud Databases): Wait for scaling task to complete

[omaraibrahim]

We currently do not wait for the scaling task to complete. This causes bad UX and does not allow the user to find out if their task was successful or if an error has occurred. This error was the result of a bad status code.

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...