Remove magic synchronization for relations (issue #19788).

[PowerGamer1]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	✔️
Fixed issues	#19788

[what-the-diff]

PR Summary

• Removal of Non-Functional Synchronization Attempts
  The system will no longer make non-functional attempts to automatically synchronize ActiveRecord relations with corresponding foreign key values. This change affects framework/CHANGELOG.md and framework/UPGRADE.md.

• GridView Improvements
  There's an improvement on GridView; it no longer calls Model::generateAttributeLabel() unnecessarily to generate label values that are not being used. This change is denoted in framework/CHANGELOG.md.

• FileTarget Log Update
  The logging process for yii\log\FileTarget has been amended, and it will no longer export empty messages - as detailed in framework/CHANGELOG.md.

• Database Query Caching
  Issues surrounding the caching of a MSSQL query with BLOB data type has been fixed in framework/CHANGELOG.md.

• Removal of Unnecessary Database Calls
  In framework/db/BaseActiveRecord.php, redundant calls to $this->resetDependentRelations() and $this->setRelationDependencies() have been removed.

• New Column Addition
  A new column profile_id has been included in tests/data/ar/Customer.php.

• Removal of Superfluous Tables and Views
  Unnecessary tables and views in all files located at tests/data/ have been removed.

• Manual Unsetting of Relations
  A note has been added in framework/UPGRADE.md about the requirement to manually unset relations before using them if they are anticipated to change.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.04% ⚠️

Comparison is base (c8c0ea9) 48.89% compared to head (bfe2ef9) 48.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19918      +/-   ##
==========================================
- Coverage   48.89%   48.85%   -0.04%     
==========================================
  Files         445      445              
  Lines       42786    42754      -32     
==========================================
- Hits        20919    20887      -32     
  Misses      21867    21867              

Files Changed	Coverage Δ
framework/db/BaseActiveRecord.php	72.40% <ø> (-1.67%)	⬇️

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