Drop the desired_config_generator_version column in workspaces table.

MR:

• Mark desired_config_generator_version ignore fo... (!205613 - merged) • Ashvin Sharma • 18.5
• Add default value to workspace.desired_config_g... (!206001 - merged) • Ashvin Sharma • 18.5
• Delete desired config generator version column (!208833 - merged) • Ashvin Sharma • 18.6
• Remove `ignore_column` in workspace model (!214075 - merged) • Ashvin Sharma • 18.7

Description

Once Shadow run: create kubernetes manifest in works... (#538163 - closed) is closed. The difference between desired and actual config will be handled by the reconciliation logic in such a way that it will not impact the existing running workspaces.

This will eliminate the need to keep desired_config_generator_version in workspaces table.

Acceptance criteria

• Remove desired_config_generator_version column from workspace table
• Update all the relevant src files
• Update all the relevant spec files