Added untriaged issue workflow.

[dblock]

Coming from opensearch-project/.github#133, create a GitHub workflow for labelling untriaged issues. Please ensure that an untriaged label with color exists before merging.

[codecov-commenter]

Codecov Report

Merging #124 (c748802) into main (897208b) will decrease coverage by 0.06%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   46.72%   46.66%   -0.06%     
==========================================
  Files          52       52              
  Lines       28810    28810              
==========================================
- Hits        13462    13445      -17     
- Misses      15348    15365      +17     

Flag	Coverage Δ
integration	42.20% <ø> (-0.10%)	⬇️
unit	6.11% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
yaml_test_runner/tests/common/client.rs	87.87% <0.00%> (-6.07%)	⬇️
opensearch/src/http/transport.rs	56.37% <0.00%> (-3.36%)	⬇️
yaml_test_runner/src/skip.rs	92.50% <0.00%> (-2.50%)	⬇️

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