Always reinstall eth2spec for non-editable installs (#4676)

Adds `--reinstall-package=eth2spec` for `uv run` commands used with
editable installs. This will ensure that `uv` doesn't used a cached
version of `eth2spec` (consensus-specs) and ensure that the most recent
version of repo source is used when generating test vectors during local
development.

Follow-up fix to:
- #4627
 
and, in particular:
- #4634

Author: danceratopz

Makefile

@@ -193,7 +193,7 @@ VENV = .venv
 # Use editable installs for all non-generation targets, but use non-editable
 # installs for generators. More details: ethereum/consensus-specs#4633.
 UV_RUN    = uv run
-UV_RUN_NE = uv run --no-editable
+UV_RUN_NE = uv run --no-editable --reinstall-package=eth2spec
 
 # Sync dependencies using uv.
 _sync: MAYBE_VERBOSE := $(if $(filter true,$(verbose)),--verbose)