This is a rather large PR that will help us modernize the TCK for future development and accomplishes the following tasks:

1. Fixes JDK warnings about generic misusage to clear up the IDE environment
2. Fixes some package names to follow the standard of the rest of the TCK
3. Removes bespoke callable/runnable tasks that could be substituted for existing common tasks.
4. Removes the TestUtil class in favor of more specialized classes that make more sense.
5. Standardize the use of Duration instead of Long to avoid confusion on what uses milliseconds vs. seconds vs. minutes
6. Refactor assertions to use assertThrows and assertTimeout
7. Creates a common package for Transaction tests to remove duplicate code
8. Removes duplicated tests

Probably should have broken this down into smaller PRs but once I started refactoring one thing everything just started falling into place.
Most of these are all separated out into individual commits for review.