db: remove secret encryption

Created by: unknwon

Fixes #15868

cc @LawnGnome: We gonna use external solution like Vault instead of building our own.

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff 4d814c371ab481389efc826319b8ace37e539876...59cc90e2149eec95a3fc1a55e21519537a28fd6b.

Notify	File(s)
@LawnGnome	internal/db/external_accounts.go internal/db/external_services.go internal/db/repos.go

Created by: codecov[bot]

Codecov Report

Merging #16008 (59cc90e) into main (1c21a3d) will increase coverage by 0.01%. The diff coverage is 72.72%.

@@            Coverage Diff             @@
##             main   #16008      +/-   ##
==========================================
+ Coverage   52.79%   52.81%   +0.01%     
==========================================
  Files        1643     1640       -3     
  Lines       82544    82340     -204     
  Branches     7270     7270              
==========================================
- Hits        43581    43484      -97     
+ Misses      35081    34998      -83     
+ Partials     3882     3858      -24     

Flag	Coverage Δ		*Carryforward flag
go	52.68% <72.72%> (+0.01%)
integration	28.57% <ø> (ø)		Carriedforward from 1c21a3d
storybook	27.85% <ø> (ø)		Carriedforward from 1c21a3d
typescript	53.11% <ø> (ø)		Carriedforward from 1c21a3d
unit	35.47% <ø> (ø)		Carriedforward from 1c21a3d

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

Impacted Files	Coverage Δ
cmd/frontend/internal/cli/serve_cmd.go	1.61% <ø> (+0.03%)
enterprise/internal/db/perms_store.go	79.07% <25.00%> (-0.05%)
internal/db/saved_searches.go	64.82% <50.00%> (ø)
internal/db/external_services.go	66.20% <75.00%> (ø)
internal/db/external_accounts.go	42.23% <85.71%> (+0.15%)
cmd/repo-updater/internal/store.go	79.94% <100.00%> (ø)
cmd/repo-updater/repos/store.go	81.74% <100.00%> (ø)
internal/db/repos.go	68.84% <100.00%> (ø)
internal/db/user_credentials.go	85.18% <100.00%> (ø)
.../internal/codeintel/resolvers/graphql/locations.go	83.50% <0.00%> (-2.07%)
... and 1 more

Created by: LawnGnome

cc @LawnGnome: We gonna use external solution like Vault instead of building our own.

Thanks for the heads up! I know this is merged already, but I did check over the campaign-relevant bits and they look good.