Optimize `try_embed_to_hash_join` in the ProjectionPushdown rule

### Is your feature request related to a problem or challenge?

From https://github.com/apache/arrow-datafusion/pull/9236/files#r1513524992,

This is a TODO in datafusion/core/src/physical_optimizer/optimizer.rs:

> TODO: `try_embed_to_hash_join` in the ProjectionPushdown rule would be block by the CoalesceBatches, so add it before CoalesceBatches. Maybe optimize it in the future.

We can optimize `try_embed_to_hash_join` in `ProjectionPushdown` rule to make it unblock by `CoalesceBatches`.

### Describe the solution you'd like

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### Describe alternatives you've considered

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### Additional context

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Read datafusion/core/src/physical_optimizer/optimizer.rs and locate try_embed_to_hash_join in the ProjectionPushdown rule. Trace how CoalesceBatches currently blocks it and review the surrounding optimizer flow. Done means the function is optimized so it is no longer blocked by CoalesceBatches, with the relevant optimizer behavior verified.

Written by the indexing model from the issue text.