Remove pulse defaults for old fake 20q backends (Qiskit/qiskit#8665)

* Remove pulse defaults for old fake 20q backends

The pulse defaults payload for the almaden, johannesburg, and singapore
fake backends are collectively taking up > 50% of the total disk
footprint of an installed copy of Qiskit. This is because the pusle
defaults for these backends predate the use the of parameterized pulse
definitions and contain arrays of sampled waveforms for the pulse
definitions. This exceedingly large file size slows down the entire
package and and makes it slower to install. When weighing the potential
value these defaults files provide for simulating and compiling with
pulse awareness for long retired devices against the real cost of
having the files included in the package there isn't a reason to keep
the files in the tree any longer. This commit removes the pulse
defaults files for these fake backends to greatly shrink the installed
package size of qiskit-terra.

* Update releasenotes/notes/remove-pulse-defs-old-20q-4ed46085b4a15678.yaml

* Update tests and docs

Several tests and docs were relying on the pulse data being present in
the fake backends. This commit updates the tests and docs to avoid this
and either rely on different fake backends that use parametric pulses or
not rely on a fake backend at all. In one case a bug is fixed the
assembler which was causing the tests to incorrectly pass because the
use of pulse backends without parametric pulses was masking incorrect
behavior.

* Revert passmanager config string test changes

* Remove self.maxDiff in str test

* Fix missing backtick

Co-authored-by: Jake Lishman <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

qiskit_ibm_provider/fake_provider/backends/almaden/fake_almaden.py

@@ -15,7 +15,7 @@
 """
 
 import os
-from qiskit.providers.fake_provider import fake_pulse_backend, fake_backend
+from qiskit.providers.fake_provider import fake_qasm_backend, fake_backend
 
 
 class FakeAlmadenV2(fake_backend.FakeBackendV2):
@@ -35,11 +35,10 @@ class FakeAlmadenV2(fake_backend.FakeBackendV2):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_almaden.json"
     props_filename = "props_almaden.json"
-    defs_filename = "defs_almaden.json"
     backend_name = "fake_almaden_v2"
 
 
-class FakeAlmaden(fake_pulse_backend.FakePulseBackend):
+class FakeAlmaden(fake_qasm_backend.FakeQasmBackend):
     """A fake Almaden backend.
 
     .. code-block:: text
@@ -56,5 +55,4 @@ class FakeAlmaden(fake_pulse_backend.FakePulseBackend):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_almaden.json"
     props_filename = "props_almaden.json"
-    defs_filename = "defs_almaden.json"
     backend_name = "fake_almaden"

qiskit_ibm_provider/fake_provider/backends/johannesburg/fake_johannesburg.py

@@ -15,7 +15,7 @@
 """
 
 import os
-from qiskit.providers.fake_provider import fake_pulse_backend, fake_backend
+from qiskit.providers.fake_provider import fake_qasm_backend, fake_backend
 
 
 class FakeJohannesburgV2(fake_backend.FakeBackendV2):
@@ -35,11 +35,10 @@ class FakeJohannesburgV2(fake_backend.FakeBackendV2):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_johannesburg.json"
     props_filename = "props_johannesburg.json"
-    defs_filename = "defs_johannesburg.json"
     backend_name = "fake_johannesburg_v2"
 
 
-class FakeJohannesburg(fake_pulse_backend.FakePulseBackend):
+class FakeJohannesburg(fake_qasm_backend.FakeQasmBackend):
     """A fake Johannesburg backend.
 
     .. code-block:: text
@@ -56,5 +55,4 @@ class FakeJohannesburg(fake_pulse_backend.FakePulseBackend):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_johannesburg.json"
     props_filename = "props_johannesburg.json"
-    defs_filename = "defs_johannesburg.json"
     backend_name = "fake_johannesburg"

qiskit_ibm_provider/fake_provider/backends/singapore/fake_singapore.py

@@ -15,7 +15,7 @@
 """
 
 import os
-from qiskit.providers.fake_provider import fake_pulse_backend, fake_backend
+from qiskit.providers.fake_provider import fake_qasm_backend, fake_backend
 
 
 class FakeSingaporeV2(fake_backend.FakeBackendV2):
@@ -35,11 +35,10 @@ class FakeSingaporeV2(fake_backend.FakeBackendV2):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_singapore.json"
     props_filename = "props_singapore.json"
-    defs_filename = "defs_singapore.json"
     backend_name = "fake_singapore_v2"
 
 
-class FakeSingapore(fake_pulse_backend.FakePulseBackend):
+class FakeSingapore(fake_qasm_backend.FakeQasmBackend):
     """A fake Singapore backend.
 
     .. code-block:: text
@@ -56,5 +55,4 @@ class FakeSingapore(fake_pulse_backend.FakePulseBackend):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_singapore.json"
     props_filename = "props_singapore.json"
-    defs_filename = "defs_singapore.json"
     backend_name = "fake_singapore"