[Reproducibility] Update report_to argument in repeat.py

Description

This MR fixes the reproducibility report_to argument, and adds a status message clarifying that reproduction is under way.

How Has This Been Tested?

This was tested on production (sorry), where I corrected run 9047 of CALLAB p900203, then marked it as deleted in the MyMDC Back Office (admin rights were temporarily granted to test this), then choosing Repeat previous calibration on MyMDC.
The reproduction was ran and new corrected files were made in the same folder, checked by their creation time and their checksum:

Before:   
7e0f721a8aa30c8f6105a8342ec32846  calibration_metadata_HED_IA1_EPX100-1.yml
7e0f721a8aa30c8f6105a8342ec32846  calibration_metadata.yml

After:  
0ebee7ac8b546f0e8822f31bc2d4a7a8  calibration_metadata_HED_IA1_EPX100-1.yml
0ebee7ac8b546f0e8822f31bc2d4a7a8  calibration_metadata.yml

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.

Reviewers

@calibration