chore: update robocop todos with non-obvious spec violations

Author: chemica

.rubocop_todo.yml

@@ -345,3 +345,23 @@ Style/ZeroLengthPredicate:
 # URISchemes: http, https
 Layout/LineLength:
   Max: 496
+
+RSpec/ExampleLength:
+  Exclude:
+    - 'spec/**/*'
+
+RSpec/MultipleMemoizedHelpers:
+  Exclude:
+    - 'spec/**/*'
+
+RSpec/InstanceVariable:
+  Exclude:
+    - 'spec/**/*'
+
+RSpec/NamedSubject:
+  Exclude:
+    - 'spec/**/*'
+
+RSpec/NestedGroups:
+  Exclude:
+    - 'spec/**/*'