[fix][client] Add logging when lib disabled sni even after passing proxy-url

[rdhabalia]

Motivation

Currently if user passes proxy-url and proxy-protocol and if user doesn't pass tls param or makes a typo in service-url-tls (eg:: ppulsar+ssl) then client lib thinks tls is disabled and doesn't enable SNI proxy without any log message which creates connection failures and makes very difficult for users to debug. so, log the message when client lib disables SNI proxy even after passing complete SNI information.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.29%. Comparing base (bbc6224) to head (fe64e62).
Report is 717 commits behind head on master.

Files with missing lines	Patch %	Lines
.../org/apache/pulsar/client/impl/ConnectionPool.java	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23545      +/-   ##
============================================
+ Coverage     73.57%   74.29%   +0.71%     
- Complexity    32624    34931    +2307     
============================================
  Files          1877     1943      +66     
  Lines        139502   147062    +7560     
  Branches      15299    16213     +914     
============================================
+ Hits         102638   109253    +6615     
- Misses        28908    29375     +467     
- Partials       7956     8434     +478     

Flag	Coverage Δ
inttests	27.32% <0.00%> (+2.73%)	⬆️
systests	24.35% <0.00%> (+0.03%)	⬆️
unittests	73.68% <50.00%> (+0.83%)	⬆️

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

Files with missing lines	Coverage Δ
.../org/apache/pulsar/client/impl/ConnectionPool.java	74.88% <50.00%> (+0.36%)	⬆️

... and 654 files with indirect coverage changes