Harvest dashboards should use a custom all value of `.*` where possible

[cgrinds]

Custom all variables

There are two kinds of All variables in harvest:

1. Normal
2. Partial

The normal All variables can be changed to .* while the partial ones can not. Changing the partial ones to use .* breaks panel queries using that var.

Evaluate that .* does not cause Prometheus performance issues and if it does not change the normal all variables to .*

TopK

• [ ] Remove pending hidden topk vars as mentioned here and replace panel queries with @ modifier

[rahulguptajss]

Opened a issue for topk #2879 to track it seperately. We'll cover .* changes here.

[cgrinds]

Verified on 24.05.0 commit 279150f8 also covered by unit test