[notebooks] update tests to remove lang param on codeblocks

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4158 Test branch datadog-api-spec/test/ruwani.dealwis/fix-api-test-notebooks

[datadog-datadog-prod-us1]

⚠️ Tests

⚠️ Warnings

🧪 4 Tests failed

    ❄️ Known flaky: Create a notebook returns "OK" response from Notebooks at features/v1/notebooks.feature

    Create a notebook returns "OK" response from Notebooks at features/v1/notebooks.feature

    Update a notebook returns "OK" response from Notebooks at features/v1/notebooks.feature

Update a notebook returns "OK" response from Notebooks at features/v1/notebooks.feature (Datadog)

There are unused HTTP interactions left in the cassette:
  - [put https://api.datadoghq.com/api/v1/notebooks/2466034] => [200 "{\"data\":{\"type\":\"notebooks\",\"id\":2466034,\"attributes\":{\"name\":\"Test-Update_a_not"]

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ℹ️ Info

❄️ No new flaky tests detected

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