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In backfill modal, explain ”Re-execute From Failure”, remove “Re-execute From…

Description

In backfill modal, explain ”Re-execute From Failure”, remove “Re-execute From Last Run”

Summary:
This should resolve https://github.com/dagster-io/dagster/issues/2989

  • Adds a tooltip with an explanation of what "Re-execute from Failure" means and changes Failure => Failures
  • Removes the "Re-execute from last run" option entirely. Users never actually asked for this feature, we just included it because we offer it in the single-pipeline re-execution case. In a backfill, it's pretty difficult to reason about because the action varies by partition.

Test Plan: Run tests

Reviewers: sandyryza

Reviewed By: sandyryza

Differential Revision: https://dagster.phacility.com/D6491