Update metadata event emission to happen every devloop and update build metadata

[MarlonGamez]

Related: #5843

Description
Updates the metadata event to include more useful information about build artifacts.
Also changes the emission to happen every devloop, as the metadata could change in between loops.

Follow-up Work (remove if N/A)
Updates to the deploy information will be made in a follow up.

[codecov]

Codecov Report

Merging #5918 (46a7610) into master (f477f48) will increase coverage by 0.01%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master    #5918      +/-   ##
==========================================
+ Coverage   70.92%   70.93%   +0.01%     
==========================================
  Files         449      449              
  Lines       16974    16981       +7     
==========================================
+ Hits        12039    12046       +7     
  Misses       4038     4038              
  Partials      897      897              

Impacted Files	Coverage Δ
pkg/skaffold/event/v2/metadata.go	88.57% <85.18%> (ø)
pkg/skaffold/runner/v1/dev.go	72.43% <100.00%> (+0.60%)	⬆️
pkg/skaffold/runner/v1/new.go	64.28% <100.00%> (+0.19%)	⬆️

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