Improve Release copy process

Some examples of current challenges:

• The current process is managed in a static pop‑up window.

• The Sources replacement step requires to manually update potentially dozens of target entries within the pop‑up, instead of substituting the source, e.g., ECC_US to ECC_EU.

• It does not allow copying by blocks, i.e. a full copy is the only option.

• Even if the job fails, a new release may be partially created.

Idea for improvement: dedicated section for release copies including:

• Configuration and preview side by side

• Allow execution by blocks, e.g. copy by subject area, by dataset

• Dataset design copy decision, i.e. create a new datasets or reuse

• Process monitoring

• Backend code support

• Releases comparison post copy: datasets, mappings, reports, ETLs, code…

This section could also manage additional features related to development reusability within Migrate.