fix: list separators depending on sort by date

[GretaD]

fixes #11567

Also changes the sorting from:

['lastHour', 'today', 'yesterday', 'lastWeek', 'lastMonth']
to
['lastHour', 'today', 'yesterday', 'lastWeek', 'lastMonth', 'Months', 'Years' ]

[st3iny]

Is the category sort order thingy fixed we discussed at the conference?

[GretaD]

Is the category sort order thingy fixed we discussed at the conference?

no, but i cannot reproduce it anymore because now that small inbox has more emails because of other tests. So, its a very specific scenario that it fails.

[st3iny]

I pushed fixes for my reviews.

delivered

[ChristophWurst]

/backport to stable5.5

[ChristophWurst]

js unit tests fail

[ChristophWurst]

  FAIL  src/tests/unit/util/groupedEnvelopes.spec.js > groupEnvelopesByDate > groups envelopes into lastHour, yesterday, lastMonth, July, and 2024
AssertionError: expected [ '0', '1', '2', '3', '4' ] to deeply equal ArrayContaining{…}

- Expected
+ Received

- ArrayContaining [
-   "lastHour",
-   "yesterday",
-   "lastMonth",
-   "July",
-   "2024",
+ [
+   "0",
+   "1",
+   "2",
+   "3",
+   "4",
  ]