fix: broken build due to failing unit tests

[kristw]

🐛 Bug Fix

• Replace response.body direct access which returns stream data input with response.text() which converts the data stream into single string (but returns Promise<string>).
  The main changes are
  • firstResponse.body => firstResponse.text()
  • secondResponse.body=> secondResponse.text()
  • response.body => secondResponse.text().
• Also change the code to async/await for readability as there are many Promise nesting.

[codecov]

Codecov Report

Merging #141 into master will increase coverage by 0.8%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #141     +/-   ##
=======================================
+ Coverage   99.19%   100%   +0.8%     
=======================================
  Files          77     77             
  Lines         988    988             
  Branches      238    238             
=======================================
+ Hits          980    988      +8     
+ Misses          6      0      -6     
+ Partials        2      0      -2

Impacted Files	Coverage Δ
...ages/superset-ui-connection/src/callApi/callApi.ts	100% <0%> (+25%)	⬆️

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