👩‍🌾 Remove bitbucket-pipelines.yml

[chapulina]

🦟 Bug fix

Fixes gazebo-tooling/release-tools#203

Summary

This will make CI default to Bionic and shouldn't change anything about CI for all release branches, which are already using Bionic.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

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https://github.com/osrf/buildfarmer/issues/224

[codecov]

Codecov Report

Merging #991 (ff471a4) into ign-gazebo3 (d468c05) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-gazebo3     #991   +/-   ##
============================================
  Coverage        77.84%   77.84%           
============================================
  Files              221      221           
  Lines            12687    12687           
============================================
  Hits              9876     9876           
  Misses            2811     2811           

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