revert(e2e): remove setuptools-scm<10 constraint

The circular build dependency (setuptools-scm → vcs-versioning →
hatchling → pluggy → setuptools-scm) has been fixed upstream.
vcs-versioning 1.1.0 switched its build backend from hatchling to
setuptools, breaking the cycle.

See: pypa/setuptools-scm#1325

Reverts: #983
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Lalatendu Mohanty <lmohanty@redhat.com>

Author: LalatenduMohanty

e2e/constraints.txt

@@ -1,9 +1,2 @@
 # This file is here in case we need to quickly add a constraint to
 # fix CI jobs.
-
-# setuptools-scm 10.0.2 added a build-system dependency on
-# vcs-versioning, which itself requires hatchling. This creates a
-# circular bootstrap dependency that causes e2e tests to fail because
-# hatchling's wheel is not yet available on the local wheel server
-# when vcs-versioning tries to install it. See #982.
-setuptools-scm<10