Revert wellknowntypes.json in worker#20521

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edgao wants to merge 2 commits intomasterfrom edgao/revert_wellknowntypes

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Commits on Dec 15, 2022

Revert "Enable record schema validation using v1 type system; CI uses MSG to start EC2 runners (#20439 )"
edgao
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unrevert ec2 runner action
edgao
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