Release v1.5.1

[AlexMSmithCA]

• Delete vestigial chunk preloading code (#273)
• Add CSP nonces to chuck script tags (#269)

[old-fusion-bot]

Triggered Fusion.js build verification: https://buildkite.com/uberopensource/fusion-release-verification/builds/788

[old-fusion-bot]

v1.5.1-1...AlexMSmithCA:auto-release-1.5.1-dEfjfoB1dc

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@c44c780). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #282   +/-   ##
=========================================
  Coverage          ?   92.25%           
=========================================
  Files             ?       18           
  Lines             ?      400           
  Branches          ?       76           
=========================================
  Hits              ?      369           
  Misses            ?       17           
  Partials          ?       14

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