Do not disclosure merge request id via email for unauthorized users
when closing issues.

changes: @user a Zoom call was added to this issue
into: @user added a Zoom call to this issue

Same concept appleis for "removed"

Add a zoom link added / removed system note when a zoom link is being
added / removed to the issue description.

These are not required because MySQL is not
supported anymore

Although `flat_map` is equivalent to `map` + `flatten(1)`
(note the level 1) we can apply this same refactoring to all cases.

Task list updates should not mark users action as spam on akismet.

to support manual sorting on the frontend

Probably useful as we often move these files to "new" files.

Replaces blockquote fences with \n,
keeping the line numbering intact.

Add project when creating milestone in specs

We validate milestone is from the same
project/parent group as issuable ->
we need to set project in specs correctly

Improve methods names and specs organization

Allow single tasks to be updated quickly

Signed-off-by: NRémy Coutable <remy@rymai.me>

Load whole file in memory to simplify code

Also refactored cleanup view to use the same localized string

Process CSV uploads async using a worker then email results

Fix leaking information of confidential issues on TODOs
when user is downgraded to guest access.