Add scanner_skip_update_pulltime property for system setting

[AllForNothing]

1. Related backend PR Skip to update pull time and pull count for scanner robot account #17807
2. This PR should be merged after Skip to update pull time and pull count for scanner robot account #17807

Signed-off-by: AllForNothing sshijun@vmware.com

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Comprehensive Summary of your change

Issue being fixed

Fixes #(issue)

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[codecov]

Codecov Report

Merging #18214 (4e09f2c) into main (4141d77) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #18214      +/-   ##
==========================================
+ Coverage   67.11%   67.14%   +0.02%     
==========================================
  Files         971      971              
  Lines      105170   105171       +1     
  Branches     2579     2579              
==========================================
+ Hits        70583    70612      +29     
+ Misses      30844    30817      -27     
+ Partials     3743     3742       -1     

Flag	Coverage Δ
unittests	67.14% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ide-nav/config/system/system-settings.component.ts	50.00% <ø> (ø)
...portal/src/app/base/left-side-nav/config/config.ts	100.00% <100.00%> (ø)
src/lib/cache/helper.go	75.00% <0.00%> (-8.34%)	⬇️
...-job/gc-page/gc/gc-history/gc-history.component.ts	40.69% <0.00%> (-5.82%)	⬇️
...audit-log-purge/history/purge-history.component.ts	40.69% <0.00%> (-5.82%)	⬇️
src/server/v2.0/handler/user.go	16.32% <0.00%> (+1.53%)	⬆️
...dashboard/schedule-card/schedule-card.component.ts	46.26% <0.00%> (+2.98%)	⬆️
src/common/utils/passports.go	90.19% <0.00%> (+3.92%)	⬆️
...ortal/src/app/shared/pipes/harbor-datetime.pipe.ts	36.00% <0.00%> (+4.00%)	⬆️
src/controller/event/topic.go	8.63% <0.00%> (+8.63%)	⬆️
... and 3 more