Self-contained-coordinator datasink related issues (build variant, runner info, metadata) fixes

[filipecosta90]

• [fix] Added platform runner info to datasink; Fixes exported timeseries from the datasink are not inheriting platform runner info #20
• [fix] Added metadata info to datasink; Fixes exported timeseries from the datasink are not inheriting the metadata from the build spec #19
• [fix] each build variant is now associated with the proper time-serie in datasink; Fixes exported datasink results are not being broken by build variants #18

[codecov-commenter]

Codecov Report

Merging #21 (58252b8) into main (c6f86a7) will increase coverage by 24.27%.
The diff coverage is 67.05%.

@@             Coverage Diff             @@
##             main      #21       +/-   ##
===========================================
+ Coverage   45.80%   70.07%   +24.27%     
===========================================
  Files           9        9               
  Lines         500      558       +58     
===========================================
+ Hits          229      391      +162     
+ Misses        271      167      -104     

Impacted Files	Coverage Δ
...ecification/__self_contained_coordinator__/args.py	18.75% <0.00%> (-1.25%)	⬇️
...tained_coordinator__/self_contained_coordinator.py	70.53% <61.90%> (+52.95%)	⬆️
...is_benchmarks_specification/__builder__/builder.py	73.38% <80.00%> (+11.07%)	⬆️
...dis_benchmarks_specification/__builder__/schema.py	100.00% <100.00%> (ø)
redis_benchmarks_specification/__common__/env.py	96.77% <100.00%> (+0.10%)	⬆️

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