Update slow optional import list to include additional packages

In Qiskit#5582 we added a script that is used to ensure we don't import
slow optional dependencies in the default 'import qiskit' path. Since
that PR merged we've managed to remove a few more packages from the
default import path (see Qiskit#5619, Qiskit#5485, and Qiskit#5620) which we should add
the same checks to to ensure we don't regress and accidently start
importing them again in the default path. This commit adds all these
packages to the list of imports not allowed as part of 'import qiskit'.

tools/find_optional_imports.py

@@ -15,14 +15,12 @@
 import subprocess
 import sys
 
-os.environ['QISKIT_SUPPRESS_PACKAGING_WARNINGS'] = 'Y'
-
-import qiskit
-
 
 def main():
     optional_imports = ['networkx', 'sympy', 'pydot', 'ipywidgets',
-                        'scipy.stats']
+                        'scipy.stats', 'matplotlib', 'qiskit.providers.aer',
+                        'qiskit.providers.ibmq', 'qiskit.ignis',
+                        'qiskit.aqua']
 
     modules_imported = []
     for mod in optional_imports: