Remove recurring exception from the Management Server logs

[bernardodemarco]

Description

Whenever the Management Server attempts to retrieve the accessing API key from an HTTP request authenticated via a session, an exception is logged at the WARN level. However, since this scenario is extremely common, the exception is logged repeatedly, which can be undesired during troubleshooting.

This PR changes the log level to TRACE and modifies the log output to only include the exception message, which contains all the information required for troubleshooting.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 20.40%. Comparing base (d3f0700) to head (31a9453).
⚠️ Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/main/java/com/cloud/user/AccountManagerImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #14441   +/-   ##
=========================================
  Coverage     20.39%   20.40%           
  Complexity    21283    21283           
=========================================
  Files          6481     6481           
  Lines        588040   588040           
  Branches      72021    72021           
=========================================
+ Hits         119957   119977   +20     
+ Misses       455052   455034   -18     
+ Partials      13031    13029    -2     

Flag	Coverage Δ
uitests	3.70% <ø> (ø)
unittests	21.70% <0.00%> (+<0.01%)	⬆️

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