Remove deprecated methods to DbMessageSource::class.

[terabytesoftw]

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

[what-the-diff]

PR Summary

• Removal of Deprecated Constant
  We've removed a previously used, but now outdated, constant CACHE_KEY_PREFIX from the DbMessageSource.php file. This helps maintain clean and efficient code, which is important for overall system performance and reducing future maintenance efforts.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -42.80% ⚠️

Comparison is base (6b91860) 67.14% compared to head (9cacd4b) 24.34%.

Additional details and impacted files

@@              Coverage Diff              @@
##                2.2   #19969       +/-   ##
=============================================
- Coverage     67.14%   24.34%   -42.80%     
  Complexity    11225    11225               
=============================================
  Files           424      424               
  Lines         35648    35647        -1     
=============================================
- Hits          23936     8680    -15256     
- Misses        11712    26967    +15255     

Files Changed	Coverage Δ
framework/i18n/DbMessageSource.php	72.72% <ø> (ø)

... and 225 files with indirect coverage changes

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