Fix self-analysis and code style after definedness-holder changes

The definedness-holder changes added three `(string)` casts on array keys
documented as strings - load-bearing under strict_types because numeric-string
keys become ints at runtime. Suppress them inline like ScopeOps does instead
of growing the baseline counts. Also sort the TryCatchHandler imports.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGhnJQpUWRRpg6H5LuWJkA

Author: ondrejmirtes

src/Analyser/ExprHandler/AssignHandler.php

@@ -2022,7 +2022,7 @@ private function processDefinednessForConditionalExpressionsAfterAssign(
 			$conditionalHolder = new ConditionalExpressionHolder([
 				'$' . $variableName => ExpressionTypeHolder::createYes(new Variable($variableName), $variableType),
 			], $holder);
-			$conditionalExpressions[(string) $exprString][$conditionalHolder->getKey()] = $conditionalHolder;
+			$conditionalExpressions[(string) $exprString][$conditionalHolder->getKey()] = $conditionalHolder; // @phpstan-ignore cast.useless
 		}
 
 		return $conditionalExpressions;

src/Analyser/MutatingScope.php

@@ -4120,7 +4120,7 @@ public function applySpecifiedTypes(SpecifiedTypes $specifiedTypes): self
 					}
 					$scope = $scope->unsetExpression($expr);
 					foreach ($rescuedHolders as $targetExprString => $targetHolders) {
-						$scope = $scope->addConditionalExpressions((string) $targetExprString, $targetHolders);
+						$scope = $scope->addConditionalExpressions((string) $targetExprString, $targetHolders); // @phpstan-ignore cast.useless
 					}
 					$specifiedExpressions[$innerExprString] = new ExpressionTypeHolder($expr, new ErrorType(), TrinaryLogic::createNo());
 				}

src/Analyser/StmtHandler/TryCatchHandler.php

@@ -6,9 +6,9 @@
 use Exception;
 use PhpParser\Node;
 use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Stmt;
 use PhpParser\Node\Stmt\TryCatch;
-use PhpParser\Node\Expr\Variable;
 use PHPStan\Analyser\ConditionalExpressionHolder;
 use PHPStan\Analyser\ExpressionResultStorage;
 use PHPStan\Analyser\ExpressionTypeHolder;
@@ -395,7 +395,7 @@ private function addCatchVariableDefinednessConditionals(
 				$conditionalHolder = new ConditionalExpressionHolder($condition, $holder);
 				$conditionalHolders[$conditionalHolder->getKey()] = $conditionalHolder;
 			}
-			$mergedScope = $mergedScope->addConditionalExpressions((string) $exprString, $conditionalHolders);
+			$mergedScope = $mergedScope->addConditionalExpressions((string) $exprString, $conditionalHolders); // @phpstan-ignore cast.useless
 		}
 
 		return $mergedScope;