ci(distributed): widen the trigger and drop the mid-suite image pull

The path allowlist covered 13 of the 99 packages the suite reaches. Commit
1dc3aeef8 touched core/config, core/services/modeladmin and core/backend and
matched no entry, so it would have merged without running the very specs that
cover it. Use the paths-ignore denylist tests-e2e.yml already uses.

Disable the testcontainers reaper: the runner is ephemeral, so the reaper buys
nothing and its unpinned image was pulled mid-suite, defeating the pre-pull.

Drop continue-on-error, which no other workflow uses and which reports a failed
run as green. The job is advisory by staying out of branch protection instead.
Pin Go to 1.26.0 to match go.mod, and add the tmate-on-failure step.

Assisted-by: Claude Opus 5 [claude-code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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