repo-updater: remove unused internal package

Created by: asdine

This removes the unused cmd/repo-updater/internal package that was introduced to ease the migration of the new repo-updater store. This package wasn't used as initially planned and is not necessary anymore.

Created by: codecov[bot]

Codecov Report

Merging #16870 (7d1a9c2) into main (ffa1199) will decrease coverage by 0.18%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #16870      +/-   ##
==========================================
- Coverage   52.45%   52.26%   -0.19%     
==========================================
  Files        1701     1698       -3     
  Lines       84396    83922     -474     
  Branches     7736     7736              
==========================================
- Hits        44271    43863     -408     
+ Misses      36234    36191      -43     
+ Partials     3891     3868      -23     

Flag	Coverage Δ		*Carryforward flag
go	51.36% <ø> (-0.28%)
integration	29.64% <ø> (ø)		Carriedforward from ffa1199
storybook	28.74% <ø> (ø)		Carriedforward from ffa1199
typescript	54.39% <ø> (ø)		Carriedforward from ffa1199
unit	35.03% <ø> (ø)		Carriedforward from ffa1199

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...nal/campaigns/resolvers/changeset_apply_preview.go	59.82% <0.00%> (-0.86%)
.../internal/codeintel/resolvers/graphql/locations.go	85.56% <0.00%> (+2.06%)