Removes `Repository#version` method and tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/repository.rb

@@ -19,7 +19,7 @@ class Repository
   #
   # For example, for entry `:readme` there's a method called `readme` which
   # stores its data in the `readme` cache key.
-  CACHED_METHODS = %i(size commit_count readme version contribution_guide
+  CACHED_METHODS = %i(size commit_count readme contribution_guide
                       changelog license_blob license_key gitignore koding_yml
                       gitlab_ci_yml branch_names tag_names branch_count
                       tag_count avatar exists? empty? root_ref).freeze
@@ -32,7 +32,6 @@ class Repository
     changelog: :changelog,
     license: %i(license_blob license_key),
     contributing: :contribution_guide,
-    version: :version,
     gitignore: :gitignore,
     koding: :koding_yml,
     gitlab_ci: :gitlab_ci_yml,
@@ -530,11 +529,6 @@ class Repository
   end
   cache_method :readme
 
-  def version
-    file_on_head(:version)
-  end
-  cache_method :version
-
   def contribution_guide
     file_on_head(:contributing)
   end

changelogs/unreleased/dz-remove-repo-version.yml

@@ -0,0 +1,4 @@
+---
+title: Remove Repository#version method and tests
+merge_request: 10734
+author:

features/steps/project/project.rb

@@ -66,12 +66,6 @@ class Spinach::Features::Project < Spinach::FeatureSteps
     expect(page).not_to have_link('Remove avatar')
   end
 
-  step 'I should see project "Shop" version' do
-    page.within '.project-side' do
-      expect(page).to have_content '6.7.0.pre'
-    end
-  end
-
   step 'change project default branch' do
     select 'fix', from: 'project_default_branch'
     click_button 'Save changes'

spec/models/repository_spec.rb

@@ -1259,7 +1259,6 @@ describe Repository, models: true do
         :changelog,
         :license,
         :contributing,
-        :version,
         :gitignore,
         :koding,
         :gitlab_ci,