ping: move aggregated repository statistics to critical telemetry

Created by: unknwon

Fixes #15883

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff 93447fd7cd41f2754cd6315ef79c724b4f190352...3c0123772fcff7d9a6b9726a9992abd025e68450.

Notify	File(s)
@christinaforney	doc/admin/pings.md

Created by: codecov[bot]

Codecov Report

Merging #16188 (3c01237) into main (c6d4770) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main   #16188      +/-   ##
==========================================
- Coverage   52.78%   52.78%   -0.01%     
==========================================
  Files        1646     1646              
  Lines       82314    82317       +3     
  Branches     7291     7395     +104     
==========================================
- Hits        43451    43450       -1     
- Misses      35011    35015       +4     
  Partials     3852     3852              

Flag	Coverage Δ
go	52.54% <0.00%> (-0.01%)
integration	28.48% <ø> (-0.06%)
storybook	28.07% <ø> (ø)
typescript	53.35% <ø> (ø)
unit	35.85% <ø> (ø)

Impacted Files	Coverage Δ
cmd/frontend/internal/app/updatecheck/client.go	3.57% <0.00%> (-0.04%)
cmd/repo-updater/repos/types.go	68.75% <0.00%> (-0.63%)

Created by: unknwon

Merging as-is, happy to address any post-merge comments!