Remove metric files from db importers
What does this MR do and why?
Helps in removing files related to #397141 (closed)
Screenshots or screen recordings
NA
How to set up and validate locally
Everything should just work without these files and pipeline should be 
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR. 
Related to #397141 (closed)
Edited  by Vitali Tatarintev