Change-Id: Ia6d13ed1d381f619666873e0cff6c1bb225388a4

Update the URL to the upper-constraints file to point to the redirect
rule on releases.openstack.org so that anyone working on this branch
will switch to the correct upper-constraints list automatically when
the requirements repository branches.

Until the requirements repository has as stable/2024.2 branch, tests will
continue to use the upper-constraints list on master.

Change-Id: I3c9ddf218f0a6821f89f7a0abaae4488e9635206

Many paramters are passed in the task_keys variable, and these
were thrown away and replaced with None in the openstack-ansible
connection plugin.

See https://paste.opendev.org/show/bPM5qp2zp83YzLt1iCYS/ for an
example set of task_keys.

Closes-Bug: 2044229
Change-Id: I03a9bf483916833e9992be30f60422ebbbbc7597
(cherry picked from commit a9c7454)

With recent changes to role_assignment module, passing an empty
`project` is treated as an error, as module attempts to set
project scope even when project is null or is empty.

In order to overcome this we apply extra logic to preserve
current behavior while allowing to avoid passing project
when the value is passed as an empty ones by roles, like Heat[1]

[1] https://opendev.org/openstack/openstack-ansible-os_heat/src/commit/8dd53ea2f190fc9d95b7960204141f8365f8264d/tasks/heat_service_setup.yml#L61

Closes-Bug: #2103512
Change-Id: Ic088dfd7aa0958d66d4fa2b10d8e72496cbb7a71
(cherry picked from commit 7b579a6)