fix(pr): reject huge --column/-COLUMN counts instead of panicking (fixes #12996)

[koopatroopa787]

Summary

Fixes #12996.

pr --column N (or the -N shortcut) with an enormous but parseable N (e.g. 9999999999999999999) panics with capacity overflow and aborts (exit 134):

$ pr --column 9999999999999999999 /tmp/pr_in
thread 'main' panicked at src/uu/pr/src/pr.rs:1272:20:
capacity overflow

N parses fine as a usize (it's smaller than usize::MAX on 64-bit), but it's later used directly as the length of several Vec allocations in to_table(), to_table_across(), and to_table_short_file() — vec![None; columns] — which overflows once columns * size_of::<Option<&FileLine>>() exceeds isize::MAX.

GNU pr rejects this up front:

$ /usr/bin/pr --column 9999999999999999999 /tmp/pr_in
/usr/bin/pr: invalid number of columns: ‘9999999999999999999’: Value too large for defined data type

Change

In src/uu/pr/src/pr.rs, after column_option_value is resolved (which already merges both the --column N and -N forms), reject any value above i32::MAX with the same "Value too large for defined data type" message GNU uses, returning exit code 1 instead of panicking.

Tests

Added test_huge_columns_does_not_panic and test_huge_columns_shortcut_does_not_panic in tests/by-util/test_pr.rs covering both the long and short option forms. All 59 existing test_pr tests still pass.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/rm/isatty (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/retry (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/symlink (passes in this run but fails in the 'main' branch)