Remove hard time limit from vf2 passes in preset passmanagers

qiskit/transpiler/preset_passmanagers/releasenotes/notes/remove-hard-time-limit-vf2-be83830ecc71f72c.yaml

@@ -0,0 +1,25 @@
+---
+upgrade:
+  - |
+    The preset pass managers generated by :func:`~.level_1_pass_manager`,
+    :func:`~.level_2_pass_manager`, and :func:`~.level_3_pass_manager` and used
+    by the :func:`~.transpile` function's ``optimization_level`` argument at
+    1, 2, and 3 respectively no longer is setting a hard time limit on the
+    :class:`~.VF2Layout` transpiler pass. This means that the pass will no
+    longer stop trying to find a better alternative perfect layout up until a
+    fixed time limit (100ms for level 1, 10 sec for level 2, and 60 sec for
+    level 3) as doing this limited the reproducibility of compilation when a
+    perfect layout was available. This means that the output when using the pass
+    might be different than before, although in all cases it would only change
+    if a lower noise set of qubits can be found over the previous output. If
+    you wish to retain the previous behavior you can create a custom
+    :class:`~.PassManager` that sets the ``time_limit`` argument on the
+    constructor for the :class:`~VF2Layout` pass.
+fixes:
+  - |
+    Fixed an issue with reproducibility of the :func:`~.transpile` function
+    when running with ``optimization_level`` 1, 2, and 3. Previously, under
+    some conditions when there were multiple perfect layouts (a layout that
+    doesn't require any SWAP gates) available the selected layout and output
+    circuit could vary regardless of whether the ``seed_transpiler`` argument
+    was set.