👩‍🌾 Remove bitbucket-pipelines

[chapulina]

🦟 Bug fix

Fixes gazebo-tooling/release-tools#203

Summary

This will make CI run using Bionic for this branch, instead of Xenial, which is EOL.

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 #241 (7bb7281) into ign-common1 (1fb5c8c) will not change coverage.
The diff coverage is n/a.

❗ Current head 7bb7281 differs from pull request most recent head ca6c01a. Consider uploading reports for the commit ca6c01a to get more accurate results

@@             Coverage Diff              @@
##           ign-common1     #241   +/-   ##
============================================
  Coverage        57.06%   57.06%           
============================================
  Files               83       83           
  Lines            11104    11104           
============================================
  Hits              6337     6337           
  Misses            4767     4767           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1fb5c8c...ca6c01a. Read the comment docs.

[chapulina]

For the record, I updated the branch permissions settings so that ign-common[0-2] don't require Focal (because it's not supported) and Homebrew (because it has test failures and warnings to be addressed).