fix class inheritance and remove outdated tests

Author: sivaram7

src/Test/Functional/Acceptance/DatabaseConfiguration83Cest.php

@@ -14,7 +14,7 @@
  *
  * @group php83
  */
-class DatabaseConfiguration83Cest extends AbstractCest
+class DatabaseConfiguration83Cest extends DatabaseConfigurationCest
 {
     /**
      * @var string

src/Test/Functional/Acceptance/ErrorMessage83Cest.php

@@ -14,7 +14,7 @@
  *
  * @group php83
  */
-class ErrorMessage83Cest extends AbstractCest
+class ErrorMessage83Cest extends ErrorMessageCest
 {
     /**
      * @var string

src/Test/Functional/Acceptance/PostDeploy83Cest.php

@@ -12,7 +12,7 @@
  *
  * @group php83
  */
-class PostDeploy83Cest extends AbstractCest
+class PostDeploy83Cest extends PostDeployCest
 {
     /**
      * @var string

src/Test/Functional/Acceptance/SplitDb82Cest.php

@@ -12,7 +12,7 @@
  *
  * @group php83
  */
-class WizardScd83Cest extends AbstractCest
+class WizardScd83Cest extends WizardScdCest
 {
     /**
      * @var string