the initial reason for this change was that graphicsmagick does not
support writing to ico files. this fact lead to a chain of changes:

1. use png instead of ico (browser support is good enough)
2. render the overlays on the client using the canvas API. this way we
   only need to store the original favion and generate the overlay versions
   dynamically.
   this change also enables (next step) to simplify the handling of the
   stock favicons as well, as we don't need to generate all the versions
   upfront.

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/40373

When copying some text from another note and paste,
it goes through `copy_as_gfm` `paste` handler
that calls `e.preventDefault()` which stops things.
But then when inserting the text, we manually trigger
an `input` event with jQuery which doesn't seem to be
picked up by Vue `v-model`.

Using copy/paste trick from https://stackoverflow.com/a/41046276/796832

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/38871

Correctly scrolls anchored content into view when the user loads the
page. This is most obvious when the user loads a link note in a
merge request & the page does not scroll down to the note.

Closes #38326

Remove unused function

Removes set favicon related methods from global scope
Improves test related with favicon

Removes convertPermissionToBoolean from global scope.
Adds tests for convertPermissionToBoolean - were non existant

Removes setParamInURL from gl.utils

Removes parseIntPagination from gl.utils namespace

Remove normalizeCRLFHeaders from gl.utils namespace

Removes normalizeHeaders from gl.utils namespace

Use gl.utils for filtered search

Fix bad import

Fix broken test by cleaning window.history namespace

Adds changelog

correctly scroll to element with sticky height offset

[ci skip]

Closes #32084