Small fixes for Asset view until we add pagination #3274, #3261, #3154, #3286
Summary:
Add a small label identifying how data is sampled for graphs in partition mode #3274
Remove interpolation from asset graphs #3154
Exclude materializations where partition=null from partitioned graphs #3261
Double amount of data displayed to slightly aleviate need for partition-key pagination #3268
Test Plan: Run snapshot tests
Reviewers: dish, prha, sandyryza
Reviewed By: sandyryza
Differential Revision: https://dagster.phacility.com/D5298