fix: Conda release workflow issue

The PR fulfills these requirements: (check all the apply)

[x] It's submitted to the main branch.
[ ] When resolving a specific issue, it's referenced in the PR's title (e.g. feat: Add a button #xxx, where "xxx" is the issue number).
[ ] When resolving a specific issue, the PR description includes Closes #xxx, where "xxx" is the issue number.
[ ] If changes were made to ui folder, unit tests (make test) still pass.
[ ] New/updated tests are included

Using the latest version of amauryval/publish_conda_package_action is necessary due to its support for buildingnoarch packages. However it fails due to mismatch of its dependencies.

Resolved by using custom fork of this action which replaces failing conda mambabuild with regular conda build.

This fix also adds the default metadata.py file for noarch builds to prevent wave command from failing after package install.

Complements the #2247 fix of #2227.

h2oai / wave