Implement bulk insert CI Job Definitions

Furkan Ayhanrequested to merge
551860-bulk-insert-ci_job_definitions into master

What does this MR do and why?

As a part of saving CI Job Definitions when pipeline creation (#551860 (closed)), this commit implements the Bulk Insert logic of CI Job Definitions.

This dedicated MR has been decided to do after reviewing !200790 (closed)!.

References

Related to #551860 (closed)

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