Enable publishing new samples under existing projects/collections

[CS76]

Is your enhancement request related to a problem? Please describe.
We would like to be able to add more samples to the existing published projects

Describe the solution you'd like
Add new samples and spectra, update the DOI meta data when published

• enable the user to upload a sample and select a project at the last step to add it to
• enable the user to upload a sample within the published project.
• publish the sample
• update the relations within the doi metadata

[NRayya]

We need to further discuss this issue along with issues such as updating the files in an already published project.
Changing the data (i.e the files themselves) requires a new doi while updating the doi metadata is allowed when only the metadata of the files is changed (i.e description, keywords...)