[Backport 2.x] Refactor dev tool console to use opensearch-js client to send request

[opensearch-trigger-bot]

Backport de06344 from #3544.

[codecov-commenter]

Codecov Report

Merging #3639 (81d3d66) into 2.x (90b4373) will decrease coverage by 0.07%.
The diff coverage is 70.00%.

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@@            Coverage Diff             @@
##              2.x    #3639      +/-   ##
==========================================
- Coverage   66.46%   66.39%   -0.07%     
==========================================
  Files        3206     3205       -1     
  Lines       61597    61573      -24     
  Branches     9503     9501       -2     
==========================================
- Hits        40941    40883      -58     
- Misses      18383    18408      +25     
- Partials     2273     2282       +9     

Flag	Coverage Δ
Linux	66.39% <70.00%> (-0.02%)	⬇️
Windows	?

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Impacted Files	Coverage Δ
.../server/routes/api/console/proxy/create_handler.ts	76.92% <70.00%> (-4.56%)	⬇️

... and 10 files with indirect coverage changes

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