Show one digit after dot in commit_per_day value in charts page.

Closes #26512

changelogs/unreleased/floating-avarage-commit-numbers.yml

+---
+title: Show one digit after dot in commit_per_day value in charts page.
+merge_request:
+author: msdundar
+type: changed

lib/gitlab/graphs/commits.rb

@@ -18,7 +18,7 @@ module Gitlab
       end
 
       def commit_per_day
-        @commit_per_day ||= @commits.size / (@duration + 1)
+        @commit_per_day ||= (@commits.size.to_f / (@duration + 1)).round(1)
       end
 
       def collect_data

spec/lib/gitlab/graphs/commits_spec.rb

@@ -29,7 +29,7 @@ describe Gitlab::Graphs::Commits do
   context 'with commits from yesterday and today' do
     subject { described_class.new([commit2, commit1_yesterday]) }
     describe '#commit_per_day' do
-      it { expect(subject.commit_per_day).to eq 1 }
+      it { expect(subject.commit_per_day).to eq 0.7 }
     end
 
     describe '#duration' do