User tokens page uses repoCount field from ExternalServices API

Created by: artemruts

Can be merged only after #17127.

Description

Tokens page will use repoCount from ExternalServices API to display more meaningful alerts to users.

Created by: arussellsaw

LGTM, but looks like the repoCount field is still in use by other parts of the code

Created by: codecov[bot]

Codecov Report

Merging #17146 (55f0f18) into main (cc8e4f1) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main   #17146      +/-   ##
==========================================
- Coverage   52.17%   52.17%   -0.01%     
==========================================
  Files        1701     1701              
  Lines       84100    84100              
  Branches     7574     7674     +100     
==========================================
- Hits        43882    43875       -7     
- Misses      36317    36325       +8     
+ Partials     3901     3900       -1     

Flag	Coverage Δ
go	51.32% <ø> (-0.02%)
integration	30.51% <ø> (-0.01%)
storybook	29.59% <ø> (ø)
typescript	54.20% <0.00%> (-0.01%)
unit	34.80% <0.00%> (ø)

Impacted Files	Coverage Δ
...ent/web/src/components/externalServices/backend.ts	5.26% <ø> (ø)
...t/web/src/user/settings/codeHosts/CodeHostItem.tsx	0.00% <ø> (ø)
...c/user/settings/codeHosts/UserAddCodeHostsPage.tsx	0.00% <0.00%> (ø)
.../internal/codeintel/resolvers/graphql/locations.go	83.50% <0.00%> (-2.07%)
...nal/campaigns/resolvers/changeset_apply_preview.go	58.97% <0.00%> (-1.71%)
client/web/src/settings/SettingsFile.tsx	70.65% <0.00%> (-1.09%)
enterprise/internal/campaigns/syncer/syncer.go	60.81% <0.00%> (-0.91%)

Created by: artemruts

LGTM, but looks like the repoCount field is still in use by other parts of the code

Thanks for LGTM, I had to merge main for all of the tests to pass. This PR relied on #17127 that's why some of the tests failed initially.