[FIX] hr_timesheet_invoice: description of invoice

Partial backport of 4d912af without the group by partner part. Do not forward
port above saas-6.

The generation of invoices from analytic lines was messy and mixed the
description of lines (e.g. redundant message when same product is invoiced twice
with different user, see opw 633047). Grouping was not consistent.
In 4d912af, grouping by partner was added with a refactoring of the grouping
method. Backport the second part only to get cleaner grouping and avoid mixing
messages.

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