replacing wix-embedded-mysql with testcontainers-java

[abvaidya]

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[abvaidya]

Fixes #2384

[abvaidya]

Testcontainers for Java is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
This PR replaces the in-memory wix-embedded-mysql with testcontainers mysql module. https://java.testcontainers.org/modules/databases/mysql/

https://github.com/wix-incubator/wix-embedded-mysql has been deprecated in favor of testcontainers.

[abvaidya]

The testcontainers project makes the relevant dependency ( in our case mysql ) available via docker container, hence there are changes needed in screwdriver.yaml workflow to install docker

Not related to this PR, but while adding code to install docker, I noticed nodejs installation was using a deprecated method, so changed that as well.

build script copies the zms schema from schema/ source dir in src/test/resources since thats the path used by testcontainers for any init script, we are using that feature to setup the zms tables for testing.

With this change, to be able to run Athenz build locally, developers should have a testcontainers compatible container runtime ( it works great with docker desktop ).