vcs/git: Handle tags without CreatorDate in git.ListTags

Created by: tsenart

Fixes #5453 (closed)

Co-authored with @flying-robot

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff 1ce7e2aeb87d2ab9d8d5db6c902db574668c7193...24a8cfc3d8c8801ee193cd7c3e213a2a206fcb0b.

Notify	File(s)
@keegancsmith	internal/vcs/git/refs.go internal/vcs/git/refs_test.go

Created by: codecov[bot]

Codecov Report

Merging #14373 into main will decrease coverage by 0.03%. The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main   #14373      +/-   ##
==========================================
- Coverage   51.78%   51.75%   -0.04%     
==========================================
  Files        1536     1536              
  Lines       77938    77939       +1     
  Branches     6982     6939      -43     
==========================================
- Hits        40362    40335      -27     
- Misses      33940    33970      +30     
+ Partials     3636     3634       -2     

Flag	Coverage Δ
#go	51.96% <90.90%> (-0.01%)
#integration	30.24% <ø> (-0.21%)
#storybook	18.06% <ø> (ø)
#typescript	51.24% <ø> (-0.11%)
#unit	33.90% <ø> (ø)

Impacted Files	Coverage Δ
internal/vcs/git/refs.go	66.66% <90.90%> (+1.70%)
.../frontend/internal/auth/userpasswd/config_watch.go	16.66% <0.00%> (-66.67%)
web/src/user/settings/backend.tsx	35.71% <0.00%> (-10.72%)
.../user/settings/profile/UserSettingsProfilePage.tsx	65.93% <0.00%> (-8.80%)
web/src/settings/MonacoSettingsEditor.tsx	60.60% <0.00%> (-8.09%)
cmd/frontend/internal/auth/userpasswd/config.go	30.43% <0.00%> (-4.35%)
web/src/settings/SettingsArea.tsx	70.49% <0.00%> (-3.28%)
web/src/settings/SettingsFile.tsx	70.65% <0.00%> (-2.18%)
web/src/user/area/UserArea.tsx	85.18% <0.00%> (-1.86%)
cmd/frontend/graphqlbackend/zoekt.go	74.29% <0.00%> (-0.26%)

Created by: flying-robot

@tsenart do we need a relevant changelog entry in here, or separately?

Created by: tsenart

@tsenart do we need a relevant changelog entry in here, or separately?

Yes, we do. Can you add one pretty please?

Created by: flying-robot

@tsenart changelog update: !14373 (merged)