Symlink glmark2 data directory in snapcraft.yaml (BugFix)

[tomli380576]

Description

The symlink hack in #1677 and #2087 no longer works in snapd 2.73 when using the strict frontend on ubuntu desktop. This PR adds the layout section to all uc versions of the checkbox snap to fix this issue once and for all. Test scripts no longer have to differentiate between deb/snap when calling glmark2.

This is a pretty huge change that will impact all checkbox snaps, so please let me know if there's a better way to do this.

Note that this only fixes the path issue. Issues with graphics libraries not found will not be fixed by this. Right now the wayland version of glmark2, when invoked from inside the snap on a classic desktop image, will immediately exit with "Error: main: Could not initialize canvas".

Resolved issues

/usr/share/glmark2 being hardcoded in glmark2

Documentation

Using bind in the uc snaps leads to an empty /usr/share/glmark2 directory in snap run --shell checkbox-cli therefore symlink was used.

Tests

Manually tested the snaps built in https://github.com/canonical/checkbox/actions/runs/20984775039 on 24.04 desktop

1. Install the snaps built by the gh action and connect the checkbox runtime plugs
2. checkbox.shell
3. run glmark2, window launches. Wayland and es2 variants are broken because of missing graphics libraries, not the data path.
4. Inside the shell, ls /usr/share/glmark2 and the path exists

TODO: test the snaps on ubuntu core

C3 submissions: see #2287

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.49%. Comparing base (f8136c5) to head (15bdbdb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2281   +/-   ##
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  Coverage   54.49%   54.49%           
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  Files         409      409           
  Lines       43970    43970           
  Branches     8100     8100           
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  Hits        23961    23961           
+ Misses      19190    19187    -3     
- Partials      819      822    +3     

Flag	Coverage Δ
provider-base	31.41% <100.00%> (ø)

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