luci-base: revise array sorting

Refactor various sort operations throughout luci-base to use the new
L.naturalCompare() comparator function.

This primarily ensures that embedded numbers are sorted numerically and
not in a lexicographical way.

It also simplifies some code as a side effect.

Ref: #5899
Signed-off-by: Jo-Philipp Wich <jo@mein.io>