Remove DesiredConfigGenerator versioned call
What does this MR do and why?
Remove DesiredConfigGenerator versioned call from response_payload_builder.rb
Versioning is removed from DesiredConfigGenerator in favor of freezing kubernetes config during the create step of workspace. As a result this code is not needed anymore. Older workspaces will use the config that is already generated for them when they were created thereby eliminating the need for the DesiredConfigGenerator to be versioned.
The version column and other model related changes will be done in a separate MR later.
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