Enhance(dashboard): optimize get policies request

[topjohncian]

Execute a single SQL instead of a batch of slow searches.

[codecov]

Codecov Report

Merging #1539 (e1c6e3f) into master (4519dc0) will decrease coverage by 0.82%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1539      +/-   ##
==========================================
- Coverage   90.05%   89.23%   -0.83%     
==========================================
  Files          99       99              
  Lines        6710     8494    +1784     
==========================================
+ Hits         6043     7580    +1537     
- Misses        503      750     +247     
  Partials      164      164              

Impacted Files	Coverage Δ
pkg/conf/conf.go	72.72% <0.00%> (-4.55%)	⬇️
pkg/util/io.go	59.25% <0.00%> (-4.38%)	⬇️
models/group.go	78.57% <0.00%> (-4.04%)	⬇️
pkg/hashid/hash.go	80.64% <0.00%> (-3.36%)	⬇️
pkg/task/pool.go	96.77% <0.00%> (-3.23%)	⬇️
pkg/filesystem/driver/remote/handler.go	81.00% <0.00%> (-3.15%)	⬇️
pkg/request/request.go	80.28% <0.00%> (-2.76%)	⬇️
pkg/cluster/pool.go	92.24% <0.00%> (-2.56%)	⬇️
models/migration.go	77.19% <0.00%> (-2.50%)	⬇️
pkg/serializer/setting.go	93.47% <0.00%> (-1.88%)	⬇️
... and 81 more

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[HFO4]

Thanks!