Migrate from pl.allegro.tech:embedded-elasticsearch to testcontainers

[moscicky]

Test dependency https://github.com/allegro/embedded-elasticsearch is no longer maintained. We should migrate to testcontainers instead.

[tarczynskitomek]

Hi! Assign me to this one, please :-)

[moscicky]

@tarczynskitomek Cool! If you need any help - let me know :)

[tarczynskitomek]

Cool, thanks! Should I have any questions, I won't hesitate to ask them here 😉