Fix the selected fields issue in csv report

[zhongnansu]

Issue #, if available:

selected fields for saved search not showing as expected on csv reports. issues, all the columns are included instead of the selected fields only.

Description of changes:

Root cause

There is a global variable metadata.selectedFields being used in the csv report logic, which doesn't reset when user switches saved searches.

Solution

create scope variable for collecting selected columns and assign to the global variable metadata

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[codecov]

Codecov Report

Merging #293 (2fc4336) into dev (1bf159c) will increase coverage by 0.04%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##              dev     #293      +/-   ##
==========================================
+ Coverage   77.61%   77.66%   +0.04%     
==========================================
  Files          32       32              
  Lines        1800     1804       +4     
  Branches      356      356              
==========================================
+ Hits         1397     1401       +4     
  Misses        398      398              
  Partials        5        5              

Impacted Files	Coverage Δ
...a-reports/server/routes/utils/dataReportHelpers.ts	59.43% <75.00%> (+0.78%)	⬆️
...rts/server/routes/utils/savedSearchReportHelper.ts	98.78% <100.00%> (+0.03%)	⬆️

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[dai-chen]

Thanks for the fix! Btw, does the UT for this file still work or not?

[zhongnansu]

Thanks for the fix! Btw, does the UT for this file still work or not?

Yes, the github action passed, which means the tests are fine

[joshuali925]

LGTM