Backport #29203
Relates to #28654, #29039 and #29050.
The "show outdated comments" flag should only apply to the file diff
view.
On the PR timeline, outdated comments are always shown. So they should
also be loaded when (un)resolving a conversation on the timeline page.
Backport #29050 by wxiaoguang
Try to improve #28949
1. Make `ctx.Data["ShowOutdatedComments"] = true` by default: it brings
consistent user experience, and sometimes the "outdated (source
changed)" comments are still valuable.
2. Show a friendly message if the comment won't show, then the end users
won't fell that "the comment disappears" (it is the special case when
`ShowOutdatedComments = false`)
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
