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[dagit] Fix responsiveness of partition graphs, flex:1 without min-width…

Description

[dagit] Fix responsiveness of partition graphs, flex:1 without min-width prevents shrinking

Summary: This is a small patch to addres https://github.com/dagster-io/dagster/issues/3537. I also removed the 1600px max-width because the new run matrix goes full-width at larger sizes and it looked odd with fixed-width content beneath it.

Test Plan: Run tests

Reviewers: dish, sandyryza

Reviewed By: dish

Differential Revision: https://dagster.phacility.com/D6228