Speedup push_down_filter_regression.slt by using uncompressed parquet (#20652)

## Which issue does this PR close?

- Closes #20524

## Rationale for this change


`push_down_filter_regression.slt ` is the sqllogictest that takes the
longest to run, even after @Tim-53 reduced its time in
- #20586

While reviewing #20586 and
trying to make the sqllogictest runs faster, I noticed that a
substantial amount of the unit test time was spent doing zstd
compression/decompression:

<img width="2423" height="841" alt="Screenshot 2026-03-02 at 12 50
24 PM"
src="https://github.com/user-attachments/assets/75cfe12b-3bb2-4ffa-9c36-63ca00b8c3ff"
/>

Thus, we can improve the test speed by skipping the zstd step

## What changes are included in this PR?

1. Don't compress the parquet files in the test

## Are these changes tested?

Yes by CI

Here are my performance runs using @kosiew 's new timing feature
```shell
cargo test --profile=ci --test sqllogictests  -- --timing-summary top
```

Main:
```
Per-file elapsed summary (deterministic):
1.    4.035s  push_down_filter_regression.slt  <-- takes  over 4 seconds
2.    3.573s  joins.slt
3.    3.492s  aggregate.slt
4.    3.316s  imdb.slt
5. ```

This PR
```
Per-file elapsed summary (deterministic):
1.    3.308s  aggregate.slt 
2.    3.290s  joins.slt
3.    3.181s  imdb.slt
4. 2.914s push_down_filter_regression.slt <--- takes less than 3 seconds
and is no longer the tallest pole
```

## Are there any user-facing changes?

Faster tests

Author: alamb

datafusion/sqllogictest/test_files/push_down_filter_regression.slt

@@ -21,7 +21,8 @@
 query I
 COPY (select i as k, i as v from generate_series(1, 10000000) as t(i))
 TO 'test_files/scratch/push_down_filter_regression/t2.parquet'
-STORED AS PARQUET;
+STORED AS PARQUET
+OPTIONS ('format.compression' 'uncompressed');
 ----
 10000000
 
@@ -92,7 +93,8 @@ COPY (
     SELECT arrow_cast('2025-01-01T00:00:00Z'::timestamptz, 'Timestamp(Microsecond, Some("UTC"))') AS start_timestamp
 )
 TO 'test_files/scratch/push_down_filter_regression/17512.parquet'
-STORED AS PARQUET;
+STORED AS PARQUET
+OPTIONS ('format.compression' 'uncompressed');
 ----
 1