Rename ValidationProcesor to DevfileProcessor in Workspaces

Issue: Rename ValidationProcesor to DevfileProcessor i... (#547504 - closed) • Ashvin Sharma • 18.1

What does this MR do and why?

Quoting @cwoolley-gitlab !192495 (comment 2535336845)

Now that we've eliminated devfile_validator.rb from the Create chain (see patch in review summary), lets rename this.

It's also doing more than just validation, it's also generating the pre-flatten parsed devfile, and the processed devfile, and sticking them in the passed context.

So lets call it DevfileProcessor instead to encapsulate all of that.

How to set up and validate locally

Run smoke test

scripts/remote_development/run-smoke-test-suite.sh

MR acceptance checklist

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