Issue #3275860: Mark our modules as experimental

added 2 commits

• 0abdc630 - mark modules as experimental
• 4df66eb7 - add a test

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added 1 commit

• 0b48c995 - fix namespace

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added 5 commits

• 0b48c995...42c8205f - 2 commits from branch project:8.x-2.x
• 4171bf44 - mark modules as experimental
• 36d97a96 - add a test
• c5fd42dd - fix namespace

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merged