Modify the GTM events to remove the default gray option

[JonellaCulmer]

What we're after:
Based on A/B testing done on the details panels icons, we plan to adjust the test and continue. Part of the adjustment involves removing the gray option from the GTM test and continuing the test with just the two blue icons.

Early results:
Early results show that user prefer the blue icons over the gray. There has been a ~10% increase in clicks for blue icons over the gray icon, with the blue plus icon having a slight edge.

Completion criteria:

• GTM stops showing the gray arrow/default icon as an option
• Only display blue plus and blue arrow icons in all applicable locations.

[JonellaCulmer]

No longer pursuing this route. Additional information can be found in this ticket:
#4987