Fix broken links in CONTRIBUTING.md

[94rain]

Comprehensive Summary of your change

Replace two broken links with their alternatives in CONTRIBUTING.md

• http://jasmine.github.io/2.4/introduction.html -> https://jasmine.github.io/
• github.com/stretchr/testify/mock -> https://github.com/stretchr/testify/blob/master/mock/doc.go

Issue being fixed

N/A

• Well Written Title and Summary of the PR
• Label the PR as needed. "area/doc"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed. (N/A)
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository. (N/A)

[zyyw]

lgtm

[codecov]

Codecov Report

Merging #17718 (d903f8c) into main (3050e85) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #17718   +/-   ##
=======================================
  Coverage   66.63%   66.63%           
=======================================
  Files         995      995           
  Lines      105912   105912           
  Branches     2602     2602           
=======================================
  Hits        70572    70572           
- Misses      31433    31438    +5     
+ Partials     3907     3902    -5     

Flag	Coverage Δ
unittests	66.63% <ø> (ø)

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

Impacted Files	Coverage Δ
src/controller/event/handler/auditlog/auditlog.go	14.28% <0.00%> (-42.86%)	⬇️
src/controller/event/topic.go	2.11% <0.00%> (-8.46%)	⬇️
...-job/gc-page/gc/gc-history/gc-history.component.ts	40.69% <0.00%> (-5.82%)	⬇️
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/core/api/internal.go	44.82% <0.00%> (+8.62%)	⬆️
...es/vulnerability/vulnerability-config.component.ts	62.96% <0.00%> (+8.88%)	⬆️
...g-retention-tasks/tag-retention-tasks.component.ts	86.11% <0.00%> (+25.00%)	⬆️