New toolkit versions are release candidates now.
Also fixed a test for e2b toolkit.
Also, I am explicitly not running test for toolkits for the post merge
workflow because they are run on every PR commit (i.e., they must pass
before we even merge)
Update the Slack notification to use the "package" notification instead
of the "toolkit" notification since this workflow runs for not only
toolkits but also our libs.
This is the first of a few PRs. Deploy to staging will fail until we
have `arcade-core`, `arcade-serve`, and `arcade-ai` released to PyPI.
This PR will release `arcade-core` to PyPI.
### PR Description
* Adds workflow that checks for changes in any pyproject.toml, and if
its version has changed, then tests, builds wheel, then publishes to
PyPI
* Updates the Dockerfile for our new structure
* Updates porter yamls
* Updates `make full-dist`
* Removes a couple unused workflows
Check out https://github.com/ArcadeAI/arcade-ai/actions/runs/15622059209
to see how the new workflow works (note that it failed publishing to
PyPI on purpose)
