feat(swagger): Upgrade to swagger and migrate to springdocs

[jasonmcintosh]

This replaces spring fox with spring docs to the latest releases.
Primary migration guide: https://springdoc.org/migrating-from-springfox.html MOST Of the changes are done downstream in various services that need to replace springfox resources and older outdated openapi spec APIs. See: https://github.com/spinnaker/gate/pull/1813/files for an example of this change.

This can mostly be automated through the use of openrewrite (which that PR documents). See https://docs.openrewrite.org/recipes/java/springdoc/swaggertospringdoc for the details of what this rewrite recipe applies. It DID NOT handle most groovy files which require a bit more hand holding on the migration. This does clean up the dependency tree fairly nicely finally!

TO NOTE: OpenAPI was completely broken due to various library upgrades (primarily spring fox to 3.0 to fix a CVE). Per various conversations (e.g. https://github.com/springfox/springfox/issues/3193#issuecomment-558748502) there were attempts to try to make spring fox 3 which has some CVE fixes work with swagger & newer openapis, but it seems to be a struggle to get these to work, and the springfox no longer seems supported. See https://github.com/springfox/springfox/issues/3834 for another example of "this library is dead and doesn't even work" on latest spring boot releases.