sandwich-webdriver, sandwich-contexts: enable at 0.3.0.0

[thomasjm]

Fixes codedownio/sandwich#100. CC @alaendle

Hopefully it's okay to add both sandwich-webdriver and its dependency sandwich-contexts together like this.

It's possible we'll need to skip the tests of sandwich-contexts, since they require Nix.

Checklist:

• Meaningful commit message, eg add my-cool-package (please not mention build-constraints.yml)

• At least 30 minutes have passed since uploading to Hackage

• On your own machine, you have successfully run the following command (find verify-package in the root of this repo):

  ./verify-package $package # or $package-$version
  

(Verified sandwich-contexts.)

[mihaimaruseac]

Tests for sandwich-contexts are failing as they expect nix:

           Run root: /home/curators/work/unpack-dir/unpacked/sandwich-contexts-0.3.0.0-4ac53faea4343eb7239489189a55f1f1f1bdedde638b7b86a8bb2c99db963ed8/test_runs/2024-11-05T01_47_20.845729156Z                    
                                                                                                                                                                                                                    
             Spec                          
                 Nix                                                                                      
                     can build a Nix environment with some binaries
                         Context exception:                                                               
                         Reason:                                                                          
                             Couldn't find "nix" binary when introducing Nix context. A Nix binary and store must already be available in the environment.
                                                                                                          
                     ^ Introduce Nix context                                                              
                     Reason: 
                         Couldn't find "nix" binary when introducing Nix context. A Nix binary and store must already be available in the environment.

Will completely skip tests for this