lakefs diagnostics query db version

[nopcoder]

Database information, used to get from metadata table,this change will enable us to query it directly for issues that our database migrate failed.

[codecov-io]

Codecov Report

Merging #939 (1cd6d1d) into master (4526447) will decrease coverage by 0.84%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #939      +/-   ##
==========================================
- Coverage   45.00%   44.15%   -0.85%     
==========================================
  Files         143      143              
  Lines       11199    11454     +255     
==========================================
+ Hits         5040     5058      +18     
- Misses       5537     5773     +236     
- Partials      622      623       +1     

Impacted Files	Coverage Δ
diagnostics/collector.go	66.27% <33.33%> (-1.20%)	⬇️
api/client.go	3.29% <0.00%> (-0.94%)	⬇️
auth/setup.go	0.00% <0.00%> (ø)
auth/service.go	36.17% <0.00%> (+0.13%)	⬆️
api/api_controller.go	38.23% <0.00%> (+0.16%)	⬆️
config/logger.go	75.00% <0.00%> (+10.71%)	⬆️

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