Replace Elastic APM with Open Telemetry

[VMelnalksnis]

Fixes #678, fixes #166, fixes #172, fixes #361

[codecov]

Codecov Report

Merging #727 (f53ddf9) into master (de5d5f7) will increase coverage by 1.21%.
The diff coverage is 87.83%.

@@            Coverage Diff             @@
##           master     #727      +/-   ##
==========================================
+ Coverage   73.49%   74.71%   +1.21%     
==========================================
  Files         323      324       +1     
  Lines        9328     9242      -86     
==========================================
+ Hits         6856     6905      +49     
+ Misses       2472     2337     -135     

Impacted Files	Coverage Δ
source/Gnomeshade.WebApi/Program.cs	51.35% <0.00%> (-2.94%)	⬇️
...de.WebApi/Configuration/OpenTelemetryExtensions.cs	97.77% <97.77%> (ø)
...bApi/Configuration/ConfigureOtlpExporterOptions.cs	100.00% <100.00%> (ø)
...bApi/Configuration/Options/OpenTelemetryOptions.cs	100.00% <100.00%> (ø)
source/Gnomeshade.WebApi/Startup.cs	98.64% <100.00%> (-0.11%)	⬇️

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