fix: address multiple issues with foreground controls for pipeline commands

[reubeno]

No description provided.

[github-actions]

Test Results

  2 files    8 suites   1m 5s ⏱️
424 tests 424 ✅ 0 💤 0 ❌
848 runs  848 ✅ 0 💤 0 ❌

Results for commit 23282a3.

♻️ This comment has been updated with latest results.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
expand_one_string	3.36 μs	3.36 μs	-0.00 μs	⚪ Unchanged
instantiate_shell	60.43 μs	60.26 μs	-0.17 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	25208.21 μs	25506.81 μs	298.60 μs	⚪ Unchanged
parse_bash_completion	5725.14 μs	5719.23 μs	-5.91 μs	⚪ Unchanged
parse_sample_script	8.96 μs	9.00 μs	0.04 μs	⚪ Unchanged
run_echo_builtin_command	92.42 μs	92.14 μs	-0.28 μs	⚪ Unchanged
run_one_builtin_command	112.37 μs	113.41 μs	1.04 μs	⚪ Unchanged
run_one_external_command	1826.22 μs	1882.34 μs	56.12 μs	🟠 +3.07%
run_one_external_command_directly	969.75 μs	958.35 μs	-11.40 μs	⚪ Unchanged

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/commands.rs	🟢 91%	🟢 90.2%	🔴 -0.8%
brush-core/src/interp.rs	🟢 89.66%	🟢 89.76%	🟢 0.1%
brush-core/src/sys/unix/signal.rs	🟠 63.64%	🟠 68.48%	🟢 4.84%
brush-core/src/sys/unix/terminal.rs	🔴 36.07%	🔴 37.74%	🟢 1.67%
Overall Coverage	🟢 76.14%	🟢 76.2%	🟢 0.06%

Minimum allowed coverage is 70%, this run produced 76.2%