Remove redundant yarn setup on pro bootstrap

[Rory-Powell]

Description

Removing the yarn setup in the bootstrap.sh script. the script will already run

• yarn
• lerna bootstrap

The setup subsequently runs:

• yarn && yarn bootstrap && yarn build

The only extra step here being the build, which shouldn't be necessary at this point

Addresses:

• no ticket

[codecov-commenter]

Codecov Report

Merging #10560 (9768282) into develop (59b81d1) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff            @@
##           develop   #10560   +/-   ##
========================================
  Coverage    69.88%   69.88%           
========================================
  Files          536      536           
  Lines        19537    19537           
  Branches      3893     3893           
========================================
  Hits         13653    13653           
  Misses        5449     5449           
  Partials       435      435           

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