Do not duplicate log messages

[lubosdz]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

There was missing EOL introduced in #16208, then fixed in #19940, but still there is redundant variable $trimmedText which duplicates in memory log messages possibly exhausting memory on large logs. This PR is only cleanup to remove it.

[what-the-diff]

PR Summary

• Modification to the 'export' function in FileTarget.php
  • The logic for verifying if there are no messages to export has been improved. Previously, we relied on detecting if the 'trimmedText' variable was empty. The new change, however, checks if the 'text' variable itself - once spaces are removed - is empty. This small but significant enhancement ensures that our export function operates more efficiently and accurately, considering scenarios where 'text' might not be empty but contains only white space.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (98c4bb8) 48.48% compared to head (7f3397a) 48.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19984      +/-   ##
==========================================
+ Coverage   48.48%   48.94%   +0.45%     
==========================================
  Files         445      445              
  Lines       42336    42817     +481     
==========================================
+ Hits        20527    20956     +429     
- Misses      21809    21861      +52     

Files	Coverage Δ
framework/log/FileTarget.php	62.65% <100.00%> (-0.45%)	⬇️

... and 15 files with indirect coverage changes

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[terabytesoftw]

Add line in changelog,

Thks,

[lubosdz]

Changelog added, thanx.