Improve clarity of blame color order indicator

Problem to solve

The timeline uses different shades of blue to visualize the order in which specific commits were made, while this information is supporting information to the committed date displayed in the list so it may meet the WCAG 1.4.1 Use of Color requirements, it may not be clear to user these pieces of information are related. In general, there may be opportunities to better display this information and improve clarity.

Proposall

Investigate if this color display is causing confusion with users and redesign list view to better connect color indicator with the commit date.

Related to #28303 (closed).