[fix][client] Reduce logging in OAuth auth to fix parsing of Pulsar cli command output

[lhotari]

Motivation

#24944 caused a regression by adding INFO logging. In many cases Pulsar CLI command output is parsed and the INFO logs will break output parsing.

Modifications

Change INFO to DEBUG level for the logging statements added in #24944

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.65%. Comparing base (62e7ebc) to head (67d231d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...pache/pulsar/client/impl/auth/oauth2/FlowBase.java	0.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #25254      +/-   ##
============================================
+ Coverage     72.22%   72.65%   +0.43%     
- Complexity    34209    34414     +205     
============================================
  Files          1959     1959              
  Lines        155401   155403       +2     
  Branches      17724    17726       +2     
============================================
+ Hits         112243   112915     +672     
+ Misses        34182    33474     -708     
- Partials       8976     9014      +38     

Flag	Coverage Δ
inttests	25.66% <0.00%> (-0.24%)	⬇️
systests	22.38% <0.00%> (+<0.01%)	⬆️
unittests	73.63% <0.00%> (+0.49%)	⬆️

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

Files with missing lines	Coverage Δ
...pache/pulsar/client/impl/auth/oauth2/FlowBase.java	62.06% <0.00%> (-5.79%)	⬇️

... and 140 files with indirect coverage changes

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