Bug 34587: Fix url validation

Bug 34587: Fix url validation

We need to check whether the url ends in a trailing "/" and also whether it ends in "/reports" for a SUSHI harvest. Two new functions are added to manage this and prevent failed harvests.

report_type is also now lowercase in the url and the dates are truncated to YYYY-MM format

Signed-off-by: Jessica Zairo <jzairo@bywatersolutions.com>
Signed-off-by: Michaela Sieber <michaela.sieber@kit.edu>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>