Testcontainer start string needs fixing

[berezovskyi]

Old strings:

server-cm-1 | 2024-04-13 18:15:04.940:INFO :oejs.AbstractConnector:main: Started ServerConnector@5c8eee0f{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
server-cm-1 | 2024-04-13 18:15:04.944:INFO :oejs.Server:**main: Started Server@**6b26e945{STARTING}[11.0.20,sto=5000] @4124ms

We were using main: Started Server@ to detect server startup in tests.

New strings:

server-rm-1 | 2024-04-13 18:19:08.408:INFO :oejs.Server:main: jetty-12.0.8; built: 2024-03-29T19:58:19.443Z; git: ffffdcc3c863b8f49901cc7c84a8157ebc5d15f9; jvm 17.0.10+7
server-rm-1 | 2024-04-13 18:19:08.461:INFO :oejs.AbstractConnector:main: Started ServerConnector@17236544{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
server-rm-1 | 2024-04-13 18:19:08.465:INFO :oejs.Server:main: Started oejs.Server@61d47554{STARTING}[12.0.8,sto=5000] @508ms

New string shall be main: Started oejs.Server@ if we go for Jetty 12 upgrade.