Replace fa-info-circle icons with GitLab SVG icon

- Replace fa-info-circle icons with GitLab SVG
information-o icon.
- Add changelog.

app/views/projects/merge_requests/diffs/_different_base.html.haml

 - if @merge_request_diff && different_base?(@start_version, @merge_request_diff)
   .mr-version-controls
     .content-block
-      = icon('info-circle')
+      = sprite_icon('information-o')
       Selected versions have different base commits.
       Changes will include
       = link_to project_compare_path(@project, from: @start_version.base_commit_sha, to: @merge_request_diff.base_commit_sha) do

app/views/projects/merge_requests/diffs/_not_all_comments_displayed.html.haml

 - if @commit || @start_version || (@merge_request_diff && !@merge_request_diff.latest?)
   .mr-version-controls
     .content-block.comments-disabled-notif.clearfix
-      = icon('info-circle')
+      = sprite_icon('information-o')
       = succeed '.' do
         - if @commit
           Only comments from the following commit are shown below

app/views/shared/issuable/_form.html.haml

@@ -46,7 +46,7 @@
 - if @merge_request_to_resolve_discussions_of
   .form-group.row
     .col-sm-10.offset-sm-2
-      = icon('info-circle')
+      = sprite_icon('information-o')
       - if @merge_request_to_resolve_discussions_of.discussions_can_be_resolved_by?(current_user)
         = hidden_field_tag 'merge_request_to_resolve_discussions_of', @merge_request_to_resolve_discussions_of.iid
         - if @discussion_to_resolve

changelogs/unreleased/225948-replace-fa-info-circle-icons-with-gitlab-svg-information-icon.yml

+---
+title: Replace fa-info-circle icons with GitLab SVG information-o icon
+merge_request: 41721
+author:
+type: changed