Consistently use monospace font for commit SHAs and branch and tag names

...cripts/cycle_analytics/components/stage_plan_component.js

...pts/cycle_analytics/components/stage_staging_component.js

...cripts/cycle_analytics/components/stage_test_component.js

app/assets/javascripts/pipelines/components/pipeline_url.js

...s/vue_merge_request_widget/components/mr_widget_header.js

...vue_merge_request_widget/components/mr_widget_pipeline.js

app/assets/javascripts/vue_shared/components/commit.js

app/assets/stylesheets/framework/gfm.scss

app/assets/stylesheets/framework/typography.scss

app/assets/stylesheets/framework/wells.scss

app/assets/stylesheets/pages/commits.scss

app/assets/stylesheets/pages/cycle_analytics.scss

app/assets/stylesheets/pages/diff.scss

app/assets/stylesheets/pages/environments.scss

app/assets/stylesheets/pages/merge_requests.scss

app/assets/stylesheets/pages/notes.scss

app/assets/stylesheets/pages/pipelines.scss

app/assets/stylesheets/pages/projects.scss

app/helpers/commits_helper.rb

app/helpers/diff_helper.rb