Improve label for multi-param test runs.

[bhavyaus]

Testing #21494

Improve label for the multi-parameterized test runs.

Including the bare minimum parameter name and value in the test explorer would be beneficial.

[eleanorjboyd]

So we used to include a larger description but it ended up getting too long (this is a bad example since the path is short) but it is as intended to have a short description.