feat: Jakarta EE 9 (Vaadin 24 6WP)

[MarcinVaadin]

Implementation of: vaadin/flow#14784

[CLAassistant]

All committers have signed the CLA.

[MarcinVaadin]

What has been done:

1. Separation of common classes to vaadin-testbench-shared
2. Added vaadin-testbench-core-junit5

• Removed parallel scheduler in favor of native JUnit5 parallel support
• DesiredCapabilities features extracted to new package
• Multiple capabilities are now run using TestTemplates with InvocationContextProvider
• Rules converted to Extensions

3. Added vaadin-integration-tests-junit5 that are using new approach

• Parallel runs configured

What needs to be done still:

1. Implement RetryRule feature in JUnit5 way

Migration notes:

1. Update imports to org.junit.jupiter.api.
2. Annotate test method with @TestBenchTest (name to be discussed) instead of @Test
3. Extend AbstractJUnit5TB6Test instead of AbstractTB6Test

[MarcinVaadin]

PR splitted into smaller chunks:

• chore: Update project version to 9.0-SNAPSHOT #1547
• chore: update maven.compiler.source/.target to 17 #1548
• feat: Migrate javax to jakarta #1549
• feat: extract common classes to vaadin-testbench-shared #1550
• feat: junit5 support for TestBench #1551