Fully remove part provider and last remaining references

[Mgonzalez-droid]

What's changed?

Remove deprecated code in place for new functionality.

What's your motivation?

openrewrite/rewrite#3754 (comment)

Anything in particular you'd like reviewers to focus on?

Is not a complete implementation due to time constraints, will be able to complete any final changes as needed. Not tested with build.

Anyone you would like to review specifically?

@timtebeek

Have you considered any alternatives or workarounds?

N/A

Any additional context

N/A

Checklist

• [ No] I've added unit tests to cover both positive and negative cases
• [ No] I've read and applied the recipe conventions and best practices
• [No ] I've used the IntelliJ IDEA auto-formatter on affected files

[timtebeek]

Thanks for getting this started! I've posted a suggestion that I'll apply to ensure we keep the original arguments.

[timtebeek]

Saving future self and others a click: We still need to fix types on the use of List.of for this case.

MigrateCollectionsSingletonListTest > templateError() FAILED
    java.lang.IllegalStateException: LST contains missing or invalid type information
    MethodInvocation->MethodInvocation->Block->MethodDeclaration->Block->ClassDeclaration->CompilationUnit
    /*~~(MethodInvocation type is missing or malformed)~~>*/List.of(new ConnectionListener() {
             @Override
             public void onCreate() {
             }
         })
        at org.openrewrite.java.Assertions.assertValidTypes(Assertions.java:87)
        at org.openrewrite.java.Assertions.validateTypes(Assertions.java:57)
        at org.openrewrite.java.Assertions$$Lambda$622/0x00007f7dc0316468.accept(Unknown Source)
        at org.openrewrite.test.RewriteTest.rewriteRun(RewriteTest.java:497)
        at org.openrewrite.test.RewriteTest.rewriteRun(RewriteTest.java:132)
        at org.openrewrite.test.RewriteTest.rewriteRun(RewriteTest.java:127)
        at org.openrewrite.java.migrate.util.MigrateCollectionsSingletonListTest.templateError(MigrateCollectionsSingletonListTest.java:38)