Remove the default date range limit from analytics dashboards

Problem to solve

In #377817 (comment 1214689565)+ we added a optional date range filter to the analytics dashboard.

As part of this a default date range limit of 31 days was erroneously added and should be removed.

Proposed solution

The default date range might still be useful for dashboards with performance limitations, so I think we should make the limit null by default and configurable.

Implementation plan

frontend weight 1️⃣

1. Add a new dateRangeLimit optional prop to customizable_dashboard.vue.
2. Add a new dateRangeLimit optional prop to customizable_dashboard/filters/date_range_filter.vue.
   • By default this is 0 or null
3. If the dateRangeLimit is falsy then the limit nor the tooltip should be applicable on gl-daterange-picker.
4. Update specs.