feat: propagate RDF initial snapshot completion

[discord9]

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Depends on GreptimeTeam/datafusion#8.

What's changed and what's your intention?

This PR propagates the completion state of remote dynamic filter initial snapshots.

• Updates the DataFusion fork pin from e8a127c28e8839964bb6aefdd909810dc11cd2c9 to 96cff4fd0fcedd217151ad18e4ef4956b401f78f, which includes DynamicFilterPhysicalExpr::is_complete() from feat: expose dynamic filter completion state datafusion#8.
• Uses alive_dyn_filter.is_complete() when building InitialDynFilterSnapshot instead of hardcoding is_complete = false.
• Adds a unit test covering a captured remote dynamic filter whose initial snapshot is already complete.

This should land after GreptimeTeam/datafusion#8 is merged, or after we decide it is acceptable to pin GreptimeDB to that DataFusion commit directly.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

[gemini-code-assist]

Code Review

This pull request updates the DataFusion dependency to a newer revision. This update allows the code to leverage a new non-blocking completion getter is_complete() on alive_dyn_filter in dyn_filter_bridge.rs, replacing a hardcoded false value. A corresponding unit test has been added to verify this behavior. There are no review comments, and I have no additional feedback to provide.

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