fix(ci): assert the base console script the 1.12 line actually ships (main) (#14586)

fix(ci): assert the base console script the 1.12 line actually ships

Ports #14584 to main. main inherited the stale `langflow-base` assertion from
#14571 when the back-merge (#14581) paired it with release-1.12.0's post-#14339
pyproject, where the base wheel declares `langflow`:

    # src/backend/base/pyproject.toml
    [project.scripts]
    langflow = "langflow.langflow_launcher:main"

Both branches have to carry this. The nightly tag push only succeeds while main
and the release branch have identical .github/workflows content -- GitHub
screens App-token pushes for workflow changes and GITHUB_TOKEN cannot carry
`workflows`, so any drift re-breaks create-nightly-tag.

Taken as release-1.12.0's copy of the file verbatim rather than re-applying the
edit, so the two branches are byte-identical by construction.