Testcontainers/Java/JUnit 5: Add missing support. Disambiguate docs.

[amotl]

Problem

It looks like the Testcontainers <-> Junit 5 demo wasn't complete as of #1164: I accidentally converted relevant test cases to use singleton containers instead, which wasn't intended.

Solution

This patch resolves it by adding the org.testcontainers:testcontainers-junit-jupiter extension, and adjusts the two test cases to actually use it, including inline comments and README.

/cc @matriv

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch testcontainers-java-more

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