fix(engine): update ReplicationLag format to be passed as integer
Description
Synchronization status response to return ReplicationLag as integer
Related issue
Examples
Checklist
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MR description has been reviewed 
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MR changes are functionally tested 
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MR does NOT have text changes OR there are text changes and they have been reviewed 
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MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed 
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MR does NOT have UI changes OR there are UI changes and they have been reviewed 
Link #425 (closed)
Edited  by Denis O