[WIP][SQL Migration] Target provisioning experience

[raymondtruong]

See corresponding sqltoolsservice PR: microsoft/sqltoolsservice#1833

This PR:

• implements a target provisioning experience, available after generating SKU recommendations which allows the user to generate a provisioning script (currently an ARM template, but can be extended in the future to include Bicep, Terraform, etc)
  • supports quick-start provisioning for all three target platforms, including all prerequisite resources
  • this also allows the user to provision their target with details such as instance name, recommended SKU configuration, and collation matching that of the source (which is a common error) pre-filled
• adds refresh buttons next to target selection dropdown, for the newly provisioned target, as currently, there's no good way to refresh the list without restarting the wizard
• fixes an unrelated issue where the SKU recommendation details blade could be opened even if there were no recommendations to show

Screenshots:

• updated SKU recommendation results view:
  
• deployment script blade:
  
• Portal template experience:
  todo

[coveralls]

Pull Request Test Coverage Report for Build 4349439127

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 41.94%

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Totals
Change from base Build 4348867436:	0.0%
Covered Lines:	28804
Relevant Lines:	63768

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💛 - Coveralls