[ui] FIx backfill partition range coloring, clarify meaning of progress bars

[bengotow]

Summary & Motivation

Related: https://linear.app/dagster-labs/issue/FE-689/backfill-ui-partition-range-display-issue

This is a handful of small fixes for the backfill partitions pages:

• These tags were rendering full-width, and the terminology (succeeded vs completed) was inconsistent. Clicking it takes you to a view of Succeeded runs, so I changed both to succeeded:
  

• On this page, the two gray colors used in the bars were very similar, which was confusing - now using backgroundDisabled():

• When viewing a backfill, there is a color bar that is not related to the color bars above - it indicates the success or failure of the subset of partitions you chose to backfill. This can be sorta confusing (why does this bar not have the gray bands from the previous screenshot?). I added a small caption: "100% complete" that clarifies that this bar relates to the backfill, not the partition set:

• The centering of these two items looked odd - aligned them to the top text baseline:

• Dates from previous years were wrapping in the new Runs Feed table - needed slightly more space:

How I Tested These Changes

I tested these changes manually using both op and asset backfills!

[github-actions]

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