Resolve #3182103 "Add void return type to PHPUnit tests"

Issue #3182103: BrowserTestBase::setUp() must be compatible with PHPUnit\Framework\TestCase::setUp()

Closes #3182103

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• 5032a643 - Issue #3182103: BrowserTestBase::tearDown() must be compatible with...

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• 2d7c3e56 - Issue #3182103: KernelTestBase::setUpBeforeClass() must be compatible with...

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• 2972cfff - Issue #3182103: KernelTestBase::assertPostConditions() must be compatible with...

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changed target branch from 9.0.x to 10.0.x

changed target branch from 10.0.x to 9.0.x