Fix rules in publish CI job

We decide to use the same publish rule in all our Python package projects.

We remove the '$CI_COMMIT_BRANCH == "master"' condition because the var CI_COMMIT_BRANCH description sais:

The commit branch name. Present only when building branches.

https://docs.gitlab.com/ee/ci/variables/predefined_variables.html

Ans we aren't building the master branch at this time.