Delete source bin dir before building the snap (craft-414)

[Blacksmoke16]

• [x] Have you followed the guidelines for contributing?
• [x] Have you signed the CLA?
• [x] Have you successfully run ./runtests.sh static?
• [x] Have you successfully run ./runtests.sh tests/unit?

---

Initial fix for https://bugs.launchpad.net/snapcraft/+bug/1936671. Longer term something could be done to filter what files/directories should be copied from the host into the VM. I.e. something like .gitignore. But this at least resolves the immediate problem until if/when that happens.

[codecov-commenter]

Codecov Report

Merging #3567 (18d9366) into master (5060014) will increase coverage by 0.03%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #3567      +/-   ##
==========================================
+ Coverage   91.13%   91.17%   +0.03%     
==========================================
  Files         278      278              
  Lines       19176    19198      +22     
==========================================
+ Hits        17477    17504      +27     
+ Misses       1699     1694       -5     

Impacted Files	Coverage Δ
snapcraft/plugins/v1/crystal.py	89.13% <83.33%> (-0.87%)	:arrow_down:
snapcraft/cli/_options.py	84.09% <0.00%> (-0.53%)	:arrow_down:
snapcraft/plugins/v2/_ros.py	58.57% <0.00%> (-0.26%)	:arrow_down:
snapcraft/plugins/v2/catkin.py	100.00% <0.00%> (ø)
snapcraft/plugins/v2/colcon.py	100.00% <0.00%> (ø)
snapcraft/plugins/v2/catkin_tools.py	100.00% <0.00%> (ø)
snapcraft/internal/repo/snaps.py	93.27% <0.00%> (+0.03%)	:arrow_up:
...apcraft/internal/build_providers/_base_provider.py	93.05% <0.00%> (+0.08%)	:arrow_up:
...t/internal/project_loader/_extensions/ros2_foxy.py	95.65% <0.00%> (+0.19%)	:arrow_up:
...internal/project_loader/_extensions/ros1_noetic.py	95.45% <0.00%> (+38.31%)	:arrow_up:

---

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 5060014...18d9366. Read the comment docs.