Modified rake task to save metadata in S3

fixes https://gitlab.ruhr-uni-bochum.de/FDM/rdm-system/antleaf-projectmanagement/-/issues/341#note_176178

added deployed for testing label

added 2 commits

• a2f5ac09 - Method is private for subject, session and modality
• 8a8e5bda - Continue rake when an object has problems saving to s3

Compare with previous version

enabled an automatic merge when the pipeline for 8a8e5bda succeeds

canceled the automatic merge

merged

mentioned in commit 43cbfa6e