Get rid of custom scylla images

[dkropachev]

Stop using custom images.

We used to use scylladb/scylla-passauth and scylladb/scylla-tls in our pipeline.
They were based on old scylla and has minimal config changes on them.
This PR removes them, to eleviate burdain to keep them updated.
Instead it makes them build on fly or just patch config via docker image cli.

Pre-review checklist

• I have split my patch into logically separate commits.
• All commit messages clearly explain what they change and why.
• I added relevant tests for new features and bug fixes.
• All commits compile, pass static checks and pass test.
• PR description sums up the changes and reasons why they should be introduced.
• I have provided docstrings for the public items that I want to introduce.
• I have adjusted the documentation in ./docs/source/.
• I added appropriate Fixes: annotations to PR description.

[github-actions]

cargo semver-checks found no API-breaking changes in this PR! 🎉🥳
Checked commit: 188964e

[dkropachev]

@wprzytula and probably you will need to backport it to scylladb:branch-0.15.x

[Lorak-mmk]

Regarding the checklist: a convention we use is to:

• Check the items that apply and were done
• Cross-out items that are not applicable (~~)
• Leave unmarked the items that were not done for some reason.

So if the PR doesn't change the documentation (because it has not reason to), then please make it unmarked and crossed out.

This lets reviewers to know if something is not done on purpose, or because it is not applicable.

The changes themselves look fine (apart from some grammar issues in the commit messages).

[dkropachev]

Regarding the checklist: a convention we use is to:

• Check the items that apply and were done
• Cross-out items that are not applicable (~~)
• Leave unmarked the items that were not done for some reason.

So if the PR doesn't change the documentation (because it has not reason to), then please make it unmarked and crossed out.

This lets reviewers to know if something is not done on purpose, or because it is not applicable.

The changes themselves look fine (apart from some grammar issues in the commit messages).

Done, please take a look.