Cleanup Legacy Files across Sample(s) Repo

[cleemullins]

The Samples repo has a number of out-of-date files that need to be cleaned up.

The work item is to:

1. Cleanup the Legacy CLI Tools references (such as this). These files should be deleted, although replacing them with a link to the old CLI Tools repo, would be reasonable.
2. "Meta" files, such as this should be deleted (or cleaned up).
3. Examine why the "media" folder is there.
4. Examine if the "build" folder can be deleted.
5. Understand why there are 2 "Migration v3 to v4" folders. Strongly consider deleting them in favor of a section in the main readme.md that just says "For migration, go to this older repo". Folder 1 /Migration/MigrationV3V4. Folder 2 /MigrationV3V4
6. The ("Experimental Samples List" in the readme.md)[https://github.com/microsoft/BotBuilder-Samples/blob/main/experimental/README.md] does not match reality. The links listed in that section all give 404s. The "Resources" section still points to myget.
7. The readme.md in the Generators section does not include the Python or Java Generators.

In addition to the above:

1. Cleanup the 35 open PRs, dating back to 2020.
2. Close out the old Web Chat Project.
3. Enable the recommended policies.
4. Cleanup the 2 Dependabot issues.
5. Assign / Triage the 68 open unassigned issues.
6. Update main readme to include JAVA Samples, which are now GA.

[clearab]

Can we add "Remove abandoned experimental samples" to this list?

[tracyboehrer]

Since @cleemullins clearly isn't going to do it, will reassign. Some had already been corrected. Will investigate the remaining.