Move basic RSpec rubocop rules to basic cops

These are rules we were already applying.

We've excluded the `factories` folder for some rules because there's a
factory defining a `context` attribute, which rubocop thought was the
`context` RSpec keyword.

.rubocop_basic.yml

@@ -169,21 +169,55 @@ Rails/UnknownEnv:
 Rails/Validation:
   Enabled: true
 
+RSpec/AroundBlock:
+  Enabled: true
+
+RSpec/BeforeAfterAll:
+  Enabled: true
+
+RSpec/EmptyExampleGroup:
+  Enabled: true
+  Exclude:
+    - spec/factories/**/*
+
+RSpec/EmptyLineAfterExampleGroup:
+  Enabled: true
+  Exclude:
+    - spec/factories/**/*
+
 RSpec/ExampleWording:
   Enabled: true
 
+RSpec/Focus:
+  Enabled: true
+
 RSpec/HookArgument:
   Enabled: true
 
+RSpec/LetBeforeExamples:
+  Enabled: true
+
 RSpec/LetSetup:
   Enabled: true
 
 RSpec/NotToNot:
   Enabled: true
 
+RSpec/OverwritingSetup:
+  Enabled: true
+
 RSpec/RepeatedExample:
   Enabled: true
 
+RSpec/ScatteredLet:
+  Enabled: true
+
+RSpec/ScatteredSetup:
+  Enabled: true
+
+RSpec/VoidExpect:
+  Enabled: true
+
 Style/PercentLiteralDelimiters:
   Enabled: true