Display number of retries in the test history table
Display number of retries in the test history table

Summary:
Useful for assessing test reliability at a glance.

{F337522}

Tooltip: {F338765}

Test Plan: Manual

Reviewers: treaster

Reviewed By: treaster

Subscribers: changesbot, kylec

Projects: #changes_ui

Differential Revision: https://tails.corp.dropbox.com/D176546

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