Logic updation for associating project with build_need

We want to remove the temporary method introduced in MR !163429 (merged) as part of #488163

As part of !163429 (merged), we created a callback method to add project_id to build_need record, the current logic does not have a way to associate project id directly, so we want to add project_id in the needs_attributes before creating the build_need record.

But while doing so, we realised that we need to update the logic to create build need records for associating project.

This issue is to track the work for the above. Along with logic updation, we would need to fix and add some specs.