Installing non-editable airflow for constraint generation (#30050)

When we are generating constraints including released version of
providers or "no providers" (which effectively means preinstalled
version of providers only), we should use non-editable installation
of airflow.

Normally in CI, we have editable version of airflow and we install
providers from sources, but this leads to skipping installation
of the preinstalled providers (it is connected to the fact that we
were earlier installing as editable and "sources only" and those
packages are marked as required, which confuses newer version of
pip. It prints that the preinstalled packages are installed, but
it does not specify the version - apparently thinking the editable
version of the install already contains them.

Since our behaviour is pretty non-standard, this is not really a
bug in pip, but it is a bug in our approach when we are adding
providers for constraint generation. Rather than using editable
installation when we add providers, we should use "regular"
installation. This seems to remove the confusion and the preinstalled
packages are also installed.

(cherry picked from commit 05242e9)

Author: potiuk

scripts/in_container/_in_container_utils.sh

@@ -261,7 +261,7 @@ function install_local_airflow_with_eager_upgrade() {
     # we add eager requirements to make sure to take into account limitations that will allow us to
     # install all providers
     # shellcheck disable=SC2086
-    pip install -e ".${extras}" ${EAGER_UPGRADE_ADDITIONAL_REQUIREMENTS} \
+    pip install ".${extras}" ${EAGER_UPGRADE_ADDITIONAL_REQUIREMENTS} \
         --upgrade --upgrade-strategy eager
 }
 
@@ -290,7 +290,7 @@ function install_all_providers_from_pypi_with_eager_upgrade() {
     # Installing it with Airflow makes sure that the version of package that matches current
     # Airflow requirements will be used.
     # shellcheck disable=SC2086
-    pip install -e ".[${NO_PROVIDERS_EXTRAS}]" "${packages_to_install[@]}" ${EAGER_UPGRADE_ADDITIONAL_REQUIREMENTS} \
+    pip install ".[${NO_PROVIDERS_EXTRAS}]" "${packages_to_install[@]}" ${EAGER_UPGRADE_ADDITIONAL_REQUIREMENTS} \
         --upgrade --upgrade-strategy eager
 
 }