Set build tools to use Java 8 when running Java 8 upgrade (#924)

* add java build tool updates to java recipes

* Drop recipes for 6 and 7

* Inline the recipes for 8 and 11 to avoid confusion in search & docs

* Remove duplicate

* Revert formatting change to unchanged file

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Co-authored-by: Tim te Beek <[email protected]>

Author: MBoegers

src/main/resources/META-INF/rewrite/java-version-8.yml

@@ -25,6 +25,8 @@ tags:
   - java8
 recipeList:
   - org.openrewrite.java.migrate.UpgradeToJava7
+  - org.openrewrite.java.migrate.UpgradeJavaVersion:
+      version: 8
   - org.openrewrite.java.migrate.MXBeanRule
   - org.openrewrite.java.migrate.BounceCastleFromJdk15OntoJdk18On
   - org.openrewrite.java.RemoveMethodInvocations: