Updates to e2e tests

[utdemir]

I was working on testing the CFMM functionality of checker.

To do that, I had to use the ctez contract to get some ctez. While doing that; I

• Found a bug on ctez contract's deployment script on our side (see the first commit).
• Reused the docker sandbox logic from checker_client library on e2e tests
• Slightly tweaked the parameters we pass to inject function to make them more reliable. Currently the tests work more often than they fail, but unfortunately there still are some intermitten failures. However it takes a really long time to try out a change, so I couldn't delve into them so much.

In the end, I ended up being able to mint some ctez, but didn't have time finish the test I want to write. I can do it tomorrow, but the PR as-is is mergeable state, so we might as well review & merge this one.

[purcell]

Lots of fiddly work here, great job