Remove src\TestSupport\TestSchemaTrait from yiisoft\db.

[terabytesoftw]

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

[codecov]

Codecov Report

Base: 96.35% // Head: 97.44% // Increases project coverage by +1.09% 🎉

Coverage data is based on head (0a3cc33) compared to base (25811b1).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 0a3cc33 differs from pull request most recent head 051b706. Consider uploading reports for the commit 051b706 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #124      +/-   ##
============================================
+ Coverage     96.35%   97.44%   +1.09%     
  Complexity      193      193              
============================================
  Files            15       15              
  Lines           521      587      +66     
============================================
+ Hits            502      572      +70     
+ Misses           19       15       -4     

Impacted Files	Coverage Δ
src/Schema.php	99.61% <100.00%> (+2.27%)	⬆️
src/Builder/InConditionBuilder.php	66.66% <0.00%> (-2.90%)	⬇️
src/DDLQueryBuilder.php	100.00% <0.00%> (ø)
src/DQLQueryBuilder.php	100.00% <0.00%> (ø)
src/ColumnSchemaBuilder.php	100.00% <0.00%> (ø)
src/CommandPDO.php	98.36% <0.00%> (+0.17%)	⬆️
src/ConnectionPDO.php	93.93% <0.00%> (+0.18%)	⬆️
src/DMLQueryBuilder.php	97.19% <0.00%> (+0.32%)	⬆️

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