fix(tests): accept '/' in durable execution ARN regex

[yaythomas]

Issue #, if available

Fixes #9037

Description of changes

DurableIntegBase.assert_invoke_output parsed the ARN line of sam local invoke output with [a-f0-9-]+, which truncates at the first /.
After aws-durable-execution-sdk-python-testing#216 the
emulator returns <uuid>/<invocation-id>, so subsequent sam local execution history|stop|get calls in the same test received only the leading UUID
and 404'd.

Switching to \S+ captures the full ARN as printed and remains
backwards-compatible with the old UUID-only form.

Description of how you validated changes

• Re-ran assert_invoke_output against the exact stdout captured in the
  failing CI run; the patched regex extracts the full
  <uuid>/<invocation-id> ARN. Old UUID-only stdout still extracts
  cleanly.
• make pr (init, schema, black-check, lint, test-all) — all green
  locally on Python 3.11.11 (9241 passed, 25 skipped, coverage 94.17%).
  Full integration suite runs in CI on this PR.

Checklist

• Add input/output type hints to new functions/methods (n/a — test-only change)
• Write design document if the changes are not straightforward (n/a)
• Write/update tests (test-only change; no source change)
• make pr passes
• make update-reproducible-reqs if dependencies were changed (n/a)
• Write documentation (n/a)

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