PMM-5734 PostgreSQL Instance Overview - Temp files

[fmbiete]

pg_stat_database_temp_files and pg_stat_database_temp_bytes values are monotonic. Showing maximum values is not useful, we should use rate/irate here.

• PMM-5734 PostgreSQL Instance Overview - Temp files Percona-Lab/pmm-submodules#791

[codecov]

Codecov Report

Merging #653 into PMM-2.0 will decrease coverage by 0.06%.
The diff coverage is 33.33%.

@@             Coverage Diff             @@
##           PMM-2.0     #653      +/-   ##
===========================================
- Coverage    34.08%   34.01%   -0.07%     
===========================================
  Files           39       39              
  Lines         1018     1020       +2     
  Branches       139      140       +1     
===========================================
  Hits           347      347              
- Misses         643      645       +2     
  Partials        28       28              

Impacted Files	Coverage Δ
...ddInstance/AddRemoteInstance/AddRemoteInstance.tsx	27.38% <33.33%> (-0.67%)	⬇️

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