RTEMS | libfs/pipe: Add pipe and pipe2 indirect handler calls (!1383)

[Chris Johns (@chris)]

Chris Johns commented on a discussion on testsuites/psxtests/psxpipe01/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1383#note_156423

 > +
 > +static int pipe2_handler( int fildes[ 2 ], int flags )
 > +{
 > +  rtems_test_assert( flags == 0x77654321 );
 > +  fildes[ 0 ] = 0xfedc;
 > +  fildes[ 1 ] = 0x5432;
 > +  return -2;
 > +}
 > +
 > +static void pipe_handler_test()
 > +{
 > +  int fd[ 2 ] = { 0, 0 };
 > +  int status = 0;
 > +
 > +  puts( "" );
 > +  puts( "Pipe handler tests:" );

The existing `scn` is not up to date. The test has:

```
*** TEST POSIX PIPE CREATION - 01 ***
Init - attempt to create pipe -- expect EFAULT
Init - create pipe -- OK
Init - dup pipe -- OK
Init - read pipe -- OK
Init - create pipe -- OK
Init - attempt to create pipe -- expect ENOMEM
Init - create pipe -- expect ENFILE
Init - create pipe -- expect ENFILE
*** END OF TEST POSIX PIPE CREATION - 01 ***
```

And it is now:

```
*** BEGIN OF TEST PSXPIPE 1 ***
*** TEST VERSION: 7.0.0.e468a3c9b4fde4c636166ba25dd67b38e65d5b6c-modified
*** TEST STATE: EXPECTED_PASS
*** TEST BUILD: RTEMS_DEBUG RTEMS_POSIX_API
*** TEST TOOLS: 15.2.0 20250808 (RTEMS 7, Build 2026.06.12, RSB 677c31c6360ca84c78e310af46c9f5b4e3ca199c, Newlib 7d4336cf)

Default pipe tests:
Init - attempt to create pipe -- expect EFAULT
Init - create pipe -- OK
Init - dup pipe -- OK
Init - read pipe -- OK
Init - create pipe -- OK
Init - attempt to create pipe -- expect ENOMEM
Init - create pipe -- expect ENFILE
Init - create pipe -- expect ENFILE

Pipe handler tests:
 Register handlers
 Check pipe handler call
 Check pipe2 handler call

*** END OF TEST PSXPIPE 1 ***
```

Ignoring all the tools and RTEMS version info the test subject line has changes

 How many others tests and wrong?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1383#note_156423
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