[SPARK-35083][FOLLOW-UP][CORE] Add migration guide for the remote scheduler pool files support
[SPARK-35083][FOLLOW-UP][CORE] Add migration guide for the remote scheduler pool files support

### What changes were proposed in this pull request?

Add remote scheduler pool files support to the migration guide.

### Why are the changes needed?

To highlight this useful support.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass exiting tests.

Closes #33785 from Ngone51/SPARK-35083-follow-up.

Lead-authored-by: yi.wu <9b81b6b572502a3d331adf0e769042567493bb36@databricks.com>
Co-authored-by: wuyi <9b81b6b572502a3d331adf0e769042567493bb36@databricks.com>
Signed-off-by: Gengliang Wang <789196f1837e809005c9b5b207ae21d5a78ca970@apache.org>

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