[SPARK-50416][CORE] A more portable terminal / pipe test needed for bin/load-spark-env.sh

### What changes were proposed in this pull request?
The last action in [bin/load-spark-env.sh](https://github.com/apache/spark/blob/d5da49d56d7dec5f8a96c5252384d865f7efd4d9/bin/load-spark-env.sh#L68) performs a test to determine whether running in a terminal or not, and whether `stdin` is reading from a pipe.   A more portable test is needed.

### Why are the changes needed?
The current approach relies on `ps` with options that vary significantly between different Unix-like systems.  Specifically, it prints an error message in both `cygwin` and `msys2` (and by extension, in all of the variations of `git-for-windows`).   It doesn't print an error message, but fails to detect a terminal session in `Linux` and `Osx/Darwin homebrew` (always thinks STDIN is a pipe).

Here's what the problem looks like in a `cygwin64` session (with `set -x` just ahead of the section of interest):

If called directly:
```bash
$ bin/load-spark-env.sh
++ ps -o stat= -p 1947
ps: unknown option -- o
Try `ps --help' for more information.
+ [[ ! '' =~ \+ ]]
+ [[ -p /dev/stdin ]]
+ export 'SPARK_BEELINE_OPTS= -Djline.terminal=jline.UnsupportedTerminal'
+ SPARK_BEELINE_OPTS=' -Djline.terminal=jline.UnsupportedTerminal'
```
Interestingly, due to the 2-part test, it does the right thing w.r.t. the Terminal test, the main problem being the error message.
If called downstream from a pipe:
```bash
$ echo "yo" | bin/load-spark-env.sh
++ ps -o stat= -p 1955
ps: unknown option -- o
Try `ps --help' for more information.
+ [[ ! '' =~ \+ ]]
+ [[ -p /dev/stdin ]]
```
Again, it correctly detects the pipe environment, but with an error message.

In WSL2 Ubuntu, the test doesn't correctly detect a non-pipe terminal session:
```bash
# /opt/spark$ bin/load-spark-env.sh
++ ps -o stat= -p 1423
+ [[ ! S+ =~ \+ ]]
# echo "yo!" | bin/load-spark-env.sh
++ ps -o stat= -p 1416
+ [[ ! S+ =~ \+ ]]
```
In `apache#134-Ubuntu SMP Fri Sep 27 20:20:17 UTC 2024`, the same failure occurs (it doesn't recognize terminal environments).

### Does this PR introduce _any_ user-facing change?
This is a proposed bug fix, and, other than fixing the bug,  should be invisible to users.

### How was this patch tested?
The patch was verified to behave as intended in terminal sessions, both interactive and piped, in the following 5 environments.
```

- Linux quadd 5.15.0-124-generic apache#134-Ubuntu SMP Fri Sep 27 20:20:17 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
- Linux d5 5.15.153.1-microsoft-standard-WSL2 #1 SMP Fri Mar 29 23:14:13 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
- MINGW64_NT-10.0-22631 d5 3.5.4-0bc1222b.x86_64 2024-09-04 18:28 UTC x86_64 Msys
- CYGWIN_NT-10.0-22631 d5 3.5.3-1.x86_64 2024-04-03 17:25 UTC x86_64 Cygwin
- Darwin suemac.local 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:21 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T8103 arm64

```
The test was to manually run the following script, verifying the expected response to both pipe and terminal sessions.
```bash
#!/bin/bash
if [ -e /usr/bin/tty -a "`tty`" != "not a tty" -a ! -p /dev/stdin ]; then
  echo "not a pipe"
else
  echo "is a pipe"
fi
```
The output of the manual test in all 5 tested environments.
```
philwalkquadd:/opt/spark
$ isPipe
not a pipe
#
$ echo "yo" | isPipe
is a pipe
#
```

### Was this patch authored or co-authored using generative AI tooling?
No

Closes apache#48937 from philwalk/portability-fix-for-load-spark-env.sh.

Authored-by: philwalk <[email protected]>
Signed-off-by: yangjie01 <[email protected]>

Author: philwalk

bin/load-spark-env.sh

@@ -65,6 +65,6 @@ export SPARK_SCALA_VERSION=2.13
 #fi
 
 # Append jline option to enable the Beeline process to run in background.
-if [[ ( ! $(ps -o stat= -p $$) =~ "+" ) && ! ( -p /dev/stdin ) ]]; then
+if [ -e /usr/bin/tty -a "`tty`" != "not a tty" -a ! -p /dev/stdin ]; then
   export SPARK_BEELINE_OPTS="$SPARK_BEELINE_OPTS -Djline.terminal=jline.UnsupportedTerminal"
 fi