[Task] Sort Experiments by latest modification date in the app drawer

[Steffengreiner]

Context
The experiments listing in the app drawer currently has no meaningful sort order — newly created experiments can appear anywhere in the list. With a growing number of experiments per project, this makes it harder for users to quickly navigate to the experiment they are looking for. Sorting by last modification date with the most recently modified experiment first ensures users can always find their most active work at the top of the list.

Current Behaviour
Experiments in the app drawer are displayed in no predictable or meaningful order.
A newly created experiment may appear in the middle of the list rather than at the top.

Expected Behaviour
Experiments in the sidebar are sorted by the latest modification date (e.g. a just now newly created experiment is appearing first)

Acceptance Criteria

• Given a project has multiple experiments, when the app drawer is opened, then experiments are listed in descending order of latest modification date (Most recently modified experiment appears first).
• Given an experiment is modified, when the user returns to or refreshes the sidebar, then the modified experiment appears at the top of the list.
• During the creation of a new experiment the last modification date is set to the creation date and the experiment is sorted accordingly in the app drawer
• Given two experiments share the same modification timestamp, when they are displayed, then their relative order is consistent and deterministic (e.g. alphabetical as a tiebreaker).

[Steffengreiner]

supercedes #1321

[sven1103]

@Steffengreiner @Shraddha0903 are you sure about this feature? That leads to changing experiment listing and users that get used to the current ordering might get confused.

[Steffengreiner]

Dear @sven1103,

Thanks for the feedback! This issue was originally reported by yourself in #1321.
It's not a hot button topic by any means but was intended as a quick win. If you foresee problems we can shelve this for now and focus on the sorting in #1409 and #1380 which are of higher priority

What i can say (and what i gathered from the feedback meetings) is that:

1.) A consistent ordering of any data entity in the DM would be preferred. (This also relates to #1409 )
2.) The experiment list in the app drawer is fine for a small number of experiments but more difficult to navigate for a lot of experiments.

Since currently there is no consistency in the experiment ordering, Currently no user can truly rely on the any expected order. Additonally, an ordering by latest modification is common for most applications.