fix(windows): use OpenSSL in Bazel builds for curl

[jinseopkim0]

This commit switches the cURL dependency to use OpenSSL instead of SChannel on Windows, which fixes a build failure when using Bazel. The quickstart is updated to use the CURL_CA_BUNDLE environment variable, and some failing tests are temporarily excluded.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (a202418) to head (54e40e3).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15809      +/-   ##
==========================================
- Coverage   92.95%   92.94%   -0.01%     
==========================================
  Files        2458     2458              
  Lines      227548   227548              
==========================================
- Hits       211518   211499      -19     
- Misses      16030    16049      +19     

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