👩‍🌾 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 #128 (d7d45b4) into ign-launch2 (5347cd0) will not change coverage.
The diff coverage is n/a.

❗ Current head d7d45b4 differs from pull request most recent head f8b9295. Consider uploading reports for the commit f8b9295 to get more accurate results

@@             Coverage Diff              @@
##           ign-launch2     #128   +/-   ##
============================================
  Coverage        30.24%   30.24%           
============================================
  Files                3        3           
  Lines              734      734           
============================================
  Hits               222      222           
  Misses             512      512           

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