Issue children count, query issue items not included

[shuofan]

What type of this PR

feature

What this PR does / why we need it:

Issue children count, query issue items not included

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• [Erda Cloud Issue Link](paste your link here)

Specified Reviewers:

/assign @Effet

ChangeLog

Language	Changelog
🇺🇸 English
🇨🇳 中文

Need cherry-pick to release versions?

Add comment like /cherry-pick release/1.0 when this PR is merged.

For details on the cherry pick process, see the cherry pick requests section under CONTRIBUTING.md.

[codecov]

Codecov Report

Merging #3286 (41e8b3c) into master (f688267) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3286      +/-   ##
==========================================
- Coverage   17.67%   17.67%   -0.01%     
==========================================
  Files        1372     1373       +1     
  Lines      142091   142255     +164     
==========================================
+ Hits        25117    25143      +26     
- Misses     114323   114490     +167     
+ Partials     2651     2622      -29     

Impacted Files	Coverage Δ
apistructs/issue.go	9.00% <ø> (ø)
modules/dop/services/issue/issue.go	2.98% <0.00%> (-0.08%)	⬇️
modules/dop/endpoints/resources.go	0.00% <0.00%> (-37.50%)	⬇️
modules/cmp/resource/summary.go	34.37% <0.00%> (-2.50%)	⬇️
...rotocol/components/cmp-cluster-list/list/render.go	28.94% <0.00%> (-1.94%)	⬇️
modules/cmp/resource/class.go	24.20% <0.00%> (-1.08%)	⬇️
apistructs/applications_resources.go	95.74% <0.00%> (-0.93%)	⬇️
...p-dashboard-workloads-list/workloadTable/render.go	56.73% <0.00%> (-0.90%)	⬇️
.../cmp-dashboard-workload-detail/podsTable/render.go	16.77% <0.00%> (-0.79%)	⬇️
.../components/cmp-dashboard-pods/podsTable/render.go	16.75% <0.00%> (-0.70%)	⬇️
... and 10 more