[SPARK-51146][INFRA][FOLLOWUP] Use awk to update release scripts

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

This PR has two changes:
1. use awk to update the scripts instead of sed, to avoid issues on Mac OS
2. insert the `export SPARK_CONNECT_MODE=1` after the first line, instead of before the last line. `spark-shell` does not put the final command invocation at the last line.

### Why are the changes needed?

fix release scripts

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

no

### How was this patch tested?

manual

### Was this patch authored or co-authored using generative AI tooling?

no

Closes #49891 from cloud-fan/release.

Authored-by: Wenchen Fan <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>

Author: cloud-fan

dev/make-distribution.sh

@@ -317,9 +317,14 @@ if [ "$MAKE_TGZ" == "true" ]; then
     TARDIR="$SPARK_HOME/$TARDIR_NAME"
     rm -rf "$TARDIR"
     cp -r "$DISTDIR" "$TARDIR"
-    sed -i -e '$s/.*/export SPARK_CONNECT_MODE=1\n&/' "$TARDIR/bin/pyspark"
-    sed -i -e '$s/.*/export SPARK_CONNECT_MODE=1\n&/' "$TARDIR/bin/spark-shell"
-    sed -i -e '$s/.*/export SPARK_CONNECT_MODE=1\n&/' "$TARDIR/bin/spark-submit"
+    # Set the Spark Connect system variable in these scripts to enable it by default.
+    awk 'NR==1{print; print "export SPARK_CONNECT_MODE=1"; next} {print}' "$TARDIR/bin/pyspark" > tmp && cat tmp > "$TARDIR/bin/pyspark"
+    awk 'NR==1{print; print "export SPARK_CONNECT_MODE=1"; next} {print}' "$TARDIR/bin/spark-shell" > tmp && cat tmp > "$TARDIR/bin/spark-shell"
+    awk 'NR==1{print; print "export SPARK_CONNECT_MODE=1"; next} {print}' "$TARDIR/bin/spark-submit" > tmp && cat tmp > "$TARDIR/bin/spark-submit"
+    awk 'NR==1{print; print "set SPARK_CONNECT_MODE=1"; next} {print}' "$TARDIR/bin/pyspark2.cmd" > tmp && cat tmp > "$TARDIR/bin/pyspark2.cmd"
+    awk 'NR==1{print; print "set SPARK_CONNECT_MODE=1"; next} {print}' "$TARDIR/bin/spark-shell2.cmd" > tmp && cat tmp > "$TARDIR/bin/spark-shell2.cmd"
+    awk 'NR==1{print; print "set SPARK_CONNECT_MODE=1"; next} {print}' "$TARDIR/bin/spark-submit2.cmd" > tmp && cat tmp > "$TARDIR/bin/spark-submit2.cmd"
+    rm tmp
     $TAR -czf "$TARDIR_NAME.tgz" -C "$SPARK_HOME" "$TARDIR_NAME"
     rm -rf "$TARDIR"
   fi