log as warning for socket connect and client bootstrap

[TingDaoK]

Issue #, if available:

• Our client bootstrap will try to connect for multiple address resolved by the host resolver. And it may have failure for some address, as long as any one succeed, we established the connection and ignore the error came from other address. Especially, as we do happy eyeball, it will try to use ipv6 and ipv4 at the same time. Most of the case, one of the connection will fail
• It's very annoy when an error level log shows up, but it's kind expected.

Description of changes:

• downgrade the level we log the error from socket connect

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Patch coverage: 75.00% and project coverage change: -0.03% ⚠️

Comparison is base (c4b661f) 79.90% compared to head (4ba58c0) 79.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #594      +/-   ##
==========================================
- Coverage   79.90%   79.88%   -0.03%     
==========================================
  Files          27       27              
  Lines        5848     5846       -2     
==========================================
- Hits         4673     4670       -3     
- Misses       1175     1176       +1     

Files Changed	Coverage Δ
source/channel_bootstrap.c	72.44% <50.00%> (-0.27%)	⬇️
source/posix/socket.c	73.91% <100.00%> (ø)

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