👩‍🌾 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

🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸

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

[codecov]

Codecov Report

Merging #385 (9f2c66f) into ign-rendering3 (9341eb2) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 9f2c66f differs from pull request most recent head b3d3753. Consider uploading reports for the commit b3d3753 to get more accurate results

@@               Coverage Diff               @@
##           ign-rendering3     #385   +/-   ##
===============================================
  Coverage           53.34%   53.35%           
===============================================
  Files                 131      131           
  Lines               12036    12036           
===============================================
+ Hits                 6421     6422    +1     
+ Misses               5615     5614    -1     

Impacted Files	Coverage Δ
...e/ignition/rendering/base/BaseGaussianNoisePass.hh	100.00% <0.00%> (+3.33%)	⬆️

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