[pdosqlexec] Added failOnConnectionError / Removed obsolete caching attribute

[siad007]

• Added failOnConnectionError
• Removed not used caching attribute

[codecov]

Codecov Report

Merging #1632 (cb9b2f1) into main (14c5bbe) will increase coverage by 0.02%.
The diff coverage is 94.73%.

@@             Coverage Diff              @@
##               main    #1632      +/-   ##
============================================
+ Coverage     57.91%   57.93%   +0.02%     
- Complexity     6954     6955       +1     
============================================
  Files           355      355              
  Lines         16829    16831       +2     
============================================
+ Hits           9746     9751       +5     
+ Misses         7083     7080       -3     

Impacted Files	Coverage Δ
src/Phing/Task/System/Pdo/PDOTask.php	79.06% <94.11%> (+6.97%)	⬆️
src/Phing/Task/System/Pdo/PDOSQLExecTask.php	78.57% <100.00%> (+0.22%)	⬆️

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