Remove embedded azdev (tools folder)

Now that azdev is published, begin removing the old versions of the tools that get installed when running dev_setup.py. This requires our CI scripts to transition to the public azdev.

**THIS WILL ALSO REQUIRE CONCURRENT CHANGES TO EXTENSIONS REPO CI**

- [x] `azdev style`
- [x] `azdev test`
- [x] `azdev cli-lint`
- [x] `azdev verify license`
- [x] `azdev verify document-map`
- [ ] `azdev verify default-modules`
- [ ] `azdev verify package`
- [ ] `azdev verify commands`
- [ ] `azdev verify module-load-perf`
- [x] `azdev verify load-all`