[WIP] Adds check if controller tmp dir exists

[Harnoor7]

Problem: Have observed rare exception:java.io.FileNotFoundException: /tmp/pinot-controller-tmp/fileUploadTemp/tmp-<id> (No such file or directory). Assumption is that OS might have deleted older file under tmp directory and hence deleted controllder tmp dir files.

Solution: Add validation to ensure the temp dirs are present whenever they are accessed. If absent then pinot should create them. solution is based on : https://howtodoinjava.com/java/io/create-directories/#2-1-files-createdirectory

Instructions:

1. The PR has to be tagged with at least one of the following labels (*):
   1. feature
   2. bugfix
   3. performance
   4. ui
   5. backward-incompat
   6. release-notes (**)
2. Remove these instructions before publishing the PR.

(*) Other labels to consider:

• testing
• dependencies
• docker
• kubernetes
• observability
• security
• code-style
• extension-point
• refactor
• cleanup

(**) Use release-notes label for scenarios like:

• New configuration options
• Deprecation of configurations
• Signature changes to public methods/interfaces
• New plugins added or old plugins removed