tests: show that snap from snapd deb can be bundled

[zyga]

Developers may want to bundle the snap executable from the snapd project into their application to get access to the snap APIs in a convenient form.

This test shows that this can be safely done for as long as the snapd deb is used as the source (not snapd snap) and that the ABI of snapd.deb and the application snap's base match.

Relates to changes made here: https://github.com/canonical/snapd/pull/14509

Jira: https://warthogs.atlassian.net/browse/SNAPDENG-32203

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.87%. Comparing base (ac897ee) to head (96ec47f). Report is 37 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14551      +/-   ##
==========================================
+ Coverage   78.85%   78.87%   +0.01%     
==========================================
  Files        1079     1082       +3     
  Lines      145615   145941     +326     
==========================================
+ Hits       114828   115109     +281     
- Misses      23601    23635      +34     
- Partials     7186     7197      +11     

Flag	Coverage Δ
unittests	78.87% <ø> (+0.01%)	:arrow_up:

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[ernestl]

Changing milestone to 2.67. It is not important to have merged when cutting the release.

[bboozzoo]

discussed the test with @zyga, he'll push an update.

[ernestl]

As per feedback from @zyga, removing from milestone 2.67 in favour of landing layout improvements.