release notes v0.20.3

OpenShift Migration Advisor — release notes — `v0.20.3`

Compare: v0.20.2 → v0.20.3

Added standalone TCO calculator for partners with cost estimation form, VMware pricing comparison, and three-year cost projections
Added export options for cost estimation results including copy-to-clipboard, JSON download, and text file download, with improved cost input controls and scrollable breakdown tables