👩‍🌾 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 #150 (aef30c7) into ign-sensors3 (e181d3e) will not change coverage.
The diff coverage is n/a.

❗ Current head aef30c7 differs from pull request most recent head c4c0d28. Consider uploading reports for the commit c4c0d28 to get more accurate results

@@              Coverage Diff              @@
##           ign-sensors3     #150   +/-   ##
=============================================
  Coverage         77.17%   77.17%           
=============================================
  Files                23       23           
  Lines              2344     2344           
=============================================
  Hits               1809     1809           
  Misses              535      535           

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[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-01-10/1228/1