Draft: Enable rake related cop rules via rubocop-rake

What does this MR do and why?

This MR enables a set of 👮 cop rule related to rake.

Contributes to #391438 (comment 1276168070).

Refs gitlab-org/ruby/gems/gitlab-styles!161 (merged).

How to set up and validate locally

unset REVEAL_RUBOCOP_TODO
bundle exec rubocop --parallel --only Rake/ClassDefinitionInTask,Rake/DuplicateNamespace,Rake/DuplicateTask,Rake/MethodDefinitionInTask,Rake/Require

# No offenses/errors

bundle exec rake 'rubocop:todo:generate[Rake/ClassDefinitionInTask,Rake/DuplicateNamespace,Rake/DuplicateTask,Rake/MethodDefinitionInTask,Rake/Require]'
git status
# No changes

RuboCop configuration diff

Via rubocop --show-cops on master and this MR:

--- before.txt	2023-02-13 13:14:43.825105730 +0100
+++ after.txt	2023-02-13 13:13:46.297421290 +0100
@@ -1,4 +1,4 @@
-# Available cops (999) + config for /home/peter/devel/gitlab/gdk/gitlab: 
+# Available cops (1004) + config for /home/peter/devel/gitlab/gdk/gitlab: 
 # Department 'API' (3):
 # Supports --autocorrect
 API/Base:
@@ -6264,10 +6264,38 @@
   Enabled: pending
   VersionAdded: '2.17'
 
-# Department 'Rake' (1):
+# Department 'Rake' (6):
+Rake/ClassDefinitionInTask:
+  Description: Do not define a class or module in rake task, because it will be defined
+    to the top level.
+  Enabled: true
+  VersionAdded: 0.3.0
+
+# Supports --autocorrect
+Rake/Desc:
+  Description: Describe the task with `desc` method.
+  Enabled: false
+  VersionAdded: 0.1.0
+
+Rake/DuplicateNamespace:
+  Description: Do not define namespace with the same name
+  Enabled: true
+  VersionAdded: 0.5.0
+
+Rake/DuplicateTask:
+  Description: Do not define tasks with the same name
+  Enabled: true
+  VersionAdded: 0.4.0
+
+Rake/MethodDefinitionInTask:
+  Description: Do not define a method in rake task, because it will be defined to the
+    top level.
+  Enabled: true
+  VersionAdded: 0.2.0
+
 Rake/Require:
   Include:
-  - "{,ee/,jh/}lib/**/*.rake"
+  - "{,ee/,jh/}lib/tasks/**/*.rake"
   - qa/tasks/**/*.rake
   Enabled: true
 

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.