Revert "v7.15.0 release (#21792)"

This reverts commit 2c816f8.

Author: wing328

.github/workflows/gradle-plugin-tests.yaml

@@ -34,22 +34,12 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-test-gradle-plugin-${{ env.cache-name }}-
             ${{ runner.os }}-test-gradle-plugin-
-      - name: mvn clean install
-        run: |
-          ./mvnw clean --no-snapshot-updates --batch-mode --quiet install -DskipTests -Dorg.slf4j.simpleLogger.defaultLogLevel=error
-      - name: Run tests with wrapper
+      - name: Run tests
         env:
           GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_ACCESS_KEY }}
         run: |
+          ./mvnw clean --no-snapshot-updates --batch-mode --quiet install -DskipTests -Dorg.slf4j.simpleLogger.defaultLogLevel=error
           (cd modules/openapi-generator-gradle-plugin/samples/local-spec && ./gradlew buildGoSdk) # using gradle-6.8.3 via wrapper
           (cd modules/openapi-generator-gradle-plugin/samples/local-spec && ./gradlew openApiGenerate)
           (cd modules/openapi-generator-gradle-plugin/samples/local-spec && ./gradlew buildDotnetSdk)
-      - name: Setup Gradle
-        uses: gradle/gradle-build-action@v3
-        with:
-          gradle-version: '8.14.3'
-      - name: Run tests without wrapper
-        env:
-          GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_ACCESS_KEY }}
-        run: |
           (cd modules/openapi-generator-gradle-plugin/samples/local-spec && gradle buildJavaResttemplateSdk) # not using gradle wrapper

modules/openapi-generator-cli/pom.xml

@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.15.0</version>
+        <version>7.15.0-SNAPSHOT</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>

modules/openapi-generator-core/pom.xml

@@ -6,7 +6,7 @@
     <artifactId>openapi-generator-project</artifactId>
     <groupId>org.openapitools</groupId>
     <!-- RELEASE_VERSION -->
-    <version>7.15.0</version>
+    <version>7.15.0-SNAPSHOT</version>
     <!-- /RELEASE_VERSION -->
     <relativePath>../../pom.xml</relativePath>
   </parent>

modules/openapi-generator-gradle-plugin/gradle.properties

@@ -1,5 +1,5 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=7.15.0
+openApiGeneratorVersion=7.15.0-SNAPSHOT
 # /RELEASE_VERSION
 
 # BEGIN placeholders

modules/openapi-generator-gradle-plugin/pom.xml

@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.15.0</version>
+        <version>7.15.0-SNAPSHOT</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>

modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties

@@ -1,3 +1,3 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=7.15.0
+openApiGeneratorVersion=7.15.0-SNAPSHOT
 # /RELEASE_VERSION

modules/openapi-generator-maven-plugin/examples/java-client.xml

@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.15.0</version>
+                <version>7.15.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>

modules/openapi-generator-maven-plugin/examples/kotlin.xml

@@ -15,7 +15,7 @@
 				<groupId>org.openapitools</groupId>
 				<artifactId>openapi-generator-maven-plugin</artifactId>
 				<!-- RELEASE_VERSION -->
-				<version>7.15.0</version>
+				<version>7.15.0-SNAPSHOT</version>
 				<!-- /RELEASE_VERSION -->
 				<executions>
 					<execution>

modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml

@@ -19,7 +19,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.15.0</version>
+                <version>7.15.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <dependencies>
                     <dependency>

modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml

@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.15.0</version>
+                <version>7.15.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>