Add `showEndOfTransaction` change stream option

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    • DB Integration & Observability
    • Fully Compatible
    • QI 2025-02-17
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      This change adds an `showEndOfTransaction` option to change streams.
      The option has values `off`, `whenAvailable` and `required`. Not setting the option is identical to `off`.
      The option value is only serialized and affects the query shape hash if it is set to `whenAvailable` or `required`. This keeps compatibility with older versions.
      The option can only be set if the feature flag `featureFlagChangeStreamEventOfTransactionEventSynthesis` is enabled, and if a v2 change stream reader can be used for the change stream.

      The option value is currently not read elsewhere, but it will be in future PRs for SPM-4826.

            Assignee:
            Jan Steemann
            Reporter:
            Jan Steemann
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