codeintel: RFC 235: Migrate SQLite data to Postgres

[efritz]

A step towards RFC 235: Move LSIF data to Postgres. Closes #13888.

This PR migrates existing data to the Postgres-backed bundle store introduced #13923. Do not merge this PR until #13924 has been completed and deployed.

[codecov]

Codecov Report

Merging #13932 into ef/postgres-store will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           ef/postgres-store   #13932   +/-   ##
==================================================
  Coverage              48.10%   48.10%           
==================================================
  Files                   1553     1553           
  Lines                  78993    78993           
  Branches                7014     7014           
==================================================
  Hits                   38001    38001           
  Misses                 37263    37263           
  Partials                3729     3729           

Flag	Coverage Δ		*Carryforward flag
#go	52.33% <0.00%> (ø)
#storybook	18.13% <0.00%> (ø)		Carriedforward from a0a918b
#typescript	37.87% <0.00%> (ø)		Carriedforward from a0a918b
#unit	33.87% <0.00%> (ø)		Carriedforward from a0a918b

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

Impacted Files	Coverage Δ
internal/db/helpers.go	100.00% <0.00%> (ø)
internal/gosrc/stdlib.go	100.00% <0.00%> (ø)
internal/conf/platform.go	100.00% <0.00%> (ø)
internal/routevar/util.go	100.00% <0.00%> (ø)
internal/timeutil/week.go	100.00% <0.00%> (ø)
internal/vcs/git/mocks.go	100.00% <0.00%> (ø)
internal/db/query/query.go	100.00% <0.00%> (ø)
internal/highlight/mocks.go	100.00% <0.00%> (ø)
internal/routevar/regexp.go	100.00% <0.00%> (ø)
cmd/searcher/search/lower.go	100.00% <0.00%> (ø)
... and 766 more

[sourcegraph-bot]

Notifying subscribers in CODENOTIFY files for diff f2dbbda...f4349bd.

Notify	File(s)
@beyang	enterprise/cmd/precise-code-intel-bundle-manager/internal/readers/migrate.go enterprise/cmd/precise-code-intel-bundle-manager/main.go
@sourcegraph/code-intelligence	enterprise/cmd/precise-code-intel-bundle-manager/internal/readers/migrate.go enterprise/cmd/precise-code-intel-bundle-manager/main.go

[Strum355]

At most maybe wrap the errors from migrateToPostgres rather than passing up raw errors, otherwise LGTM :)