Fix GHA release workflow (#5717)

This commit aims to fix the `Release Pipeline` of the GHA workflows
(better said, to make it support testing releases, those triggered by
tags following the pattern `test-vX.Y.Z`). Currently, it is failing
because in the `Kubeapps General` workflow, we are setting the
`running_on_tag` output variable of the `setup` job based on whether the
Git ref type is `tag` and it matches the pattern `vX.Y.Z`. Given that we
are controlling what tag patterns can trigger a release in the `Release
Pipeline` workflow, it doesn't make sense to have this condition, as we
need to make sure that it's in sync with what there is in the workflow
conditions, and it's error-prone.

Signed-off-by: Jesús Benito Calzada <bjesus@vmware.com>

Author: Jesús Miguel Benito Calzada

.github/workflows/kubeapps-general.yaml

@@ -134,7 +134,7 @@ jobs:
             echo "running_on_main=false" >> $GITHUB_OUTPUT
           fi
 
-          if [[ ${GITHUB_REF_TYPE} == "tag" && ${GITHUB_REF_NAME} =~ ^v[0-9]+ ]]; then
+          if [[ ${GITHUB_REF_TYPE} == "tag" ]]; then
             echo "running_on_tag=true" >> $GITHUB_OUTPUT
           else
             echo "running_on_tag=false" >> $GITHUB_OUTPUT