Merge branch 'style/enable-rubocop-indent-assignment-cop' into 'master'

Enable Style/IndentAssignment Rubocop style cop

Checks the indentation of the first line of the right-hand-side of a multi-line assignment.

See #17478

See merge request !4348

.rubocop.yml

@@ -286,7 +286,7 @@ Style/IdenticalConditionalBranches:
 # Checks the indentation of the first line of the right-hand-side of a
 # multi-line assignment.
 Style/IndentAssignment:
-  Enabled: false
+  Enabled: true
 
 # Keep indentation straight.
 Style/IndentationConsistency: