- Adds `searchBy` util in common utils
- Adds placeholder `SidebarItemEpicsSelect`

A nonce-based Content-Security-Policy thwarts XSS attacks by allowing
inline JavaScript to execute if the script nonce matches the header
value. Rails 5.2 supports nonce-based Content-Security-Policy headers,
so provide configuration to enable this and make it work.

To support this, we need to change all `:javascript` HAML filters to the
following form:

```
= javascript_tag nonce: true do
  :plain
    ...
```

We use `%script` throughout our HAML to store JSON and other text, but
since this doesn't execute, browsers don't appear to block this content
from being used and require the nonce value to be present.

This reverts commit 28f2225b, reversing
changes made to 96ae5bd8.

It will be hooked up to the markdown editor later

This has the benefit that CE bundles will remove dead code in CE only
builds.

We have a follow-up issue to get rid of this completely:

https://gitlab.com/gitlab-org/gitlab-ce/issues/64173

Added offset adjustment for diff file header and version menus
container divs. This should make the linked line be visible.

This change brings new Scoped labels to Issue board as well.
With the last change, this was missed.

- Compare versions header is full width except in the unified diff mode
with no tree sidebar
  - Bar is always full width, but the content within stays centered when
unified and no tree sidebar
- File header is the same height as the "Compare versions header"
- aligns with the design system grid guidelines => 56px
- Diff file headers use a button group, switch icon order to open file
externally being the last option, all buttons will become icon buttons
(icon delivery by @dimitrieh)
- If a file header becomes sticky no rounded corner/double border
problem is visible anymore

- Add an ID to the diff content
- handle clicking on file name in diffFileHeader when it is not a link
to another page but rather a link to an element on the page

Adds EE information to gon
Creates a global vue mixin

EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9530

Resizes metrics graph on window and sidebard width changes

Does following enhancements to `convertObjectPropsToCamelCase` helper;
- Adds support for `dropKeys` within  options param
to discard properties.
- Adds support for `allowKeys` within options param
to skip converting property names.

Removing the URL manipulation functions added to 'common_utils.js' in favor of the functions that already existed in 'url_utility.js'. Refactoring 'removeParams' function in 'url_utility.js' to allow url to be passed and to preserve the original host and/or path provided in the url.

Replacing inline JS with ES 2015 functions included in pages/sessions/new. Also applying suggested server-side syntax improvements to OmniAuthCallbacksController.

This file tree displays all the diff files in a tree like format
Each file is taken and converted into a tree with folders
Each folder can be toggled open & closed
Clicking a file will scroll to the diff file & highlight with a glow affect

Searching the tree list will search only files & return a list of the
files without any folders

Each file row contains an icon to show changed, new file or deleted
Each row will also contain the added & removed lines count

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14249

Resolve "Link to file in Changes tab of MR no longer works for all files after incremental rendering improvement"

Partially addresses #47006.

Partially addresses #47006.