fix: correct issues with ! extglobs and compgen -X

[reubeno]

Fixes multiple issues with extglob pattern matching support, particularly with !(...) patterns. Additional changes for use of patterns as filter expressions in completion (notably, fixes to inversion).

Updates to pattern parsing:

• brush-parser/src/pattern.rs: Refactored the extended_glob_body rule to simplify the parsing of extended glob patterns and adjusted how negative lookaheads are handled in the regex generation. [1] [2] [3]

Addition of test cases:

• brush-core/src/patterns.rs: Added extensive test cases to verify the behavior of pattern matching with and without extended globbing, covering various scenarios including basic, advanced, and degenerate cases.
• brush-shell/tests/cases/builtins/compgen.yaml: Added new test cases for the compgen command with extended globbing enabled.
• brush-shell/tests/cases/patterns.yaml: Added new test cases for pathname expansion with extended globbing, including degenerate inverted patterns. [1] [2]

Other changes:

• brush-shell/tests/completion_tests.rs: Adjusted the expected results in the complete_path_args_to_well_known_programs test to reflect the updated completion logic.

Copilot reviewed 5 out of 7 changed files in this pull request and generated no comments.

Files not reviewed (2)

• brush-core/src/completion.rs: Evaluated as low risk
• brush-shell/tests/completion_tests.rs: Evaluated as low risk

[github-actions]

Test Results

    2 files      9 suites   1m 17s ⏱️
  585 tests   585 ✅ 0 💤 0 ❌
1 156 runs  1 156 ✅ 0 💤 0 ❌

Results for commit e573b85.

♻️ This comment has been updated with latest results.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
clone_shell_object	16.76 μs	16.40 μs	-0.36 μs	🟢 -2.16%
eval_arithmetic	0.18 μs	0.19 μs	0.00 μs	⚪ Unchanged
expand_one_string	1.71 μs	1.61 μs	-0.09 μs	⚪ Unchanged
for_loop	33.02 μs	32.32 μs	-0.70 μs	🟢 -2.12%
function_call	3.35 μs	3.27 μs	-0.08 μs	⚪ Unchanged
instantiate_shell	47.53 μs	48.41 μs	0.89 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	22405.01 μs	22252.38 μs	-152.63 μs	⚪ Unchanged
parse_bash_completion	1686.54 μs	1681.00 μs	-5.54 μs	⚪ Unchanged
parse_sample_script	2.22 μs	2.17 μs	-0.05 μs	🟢 -2.34%
run_echo_builtin_command	16.20 μs	16.03 μs	-0.16 μs	⚪ Unchanged
run_one_external_command	1982.57 μs	2048.34 μs	65.77 μs	🟠 +3.32%

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/builtins/complete.rs	🟠 75%	🟢 75.58%	🟢 0.58%
brush-core/src/completion.rs	🟠 63.1%	🟠 63.18%	🟢 0.08%
brush-core/src/jobs.rs	🔴 43.1%	🔴 37.07%	🔴 -6.03%
brush-core/src/patterns.rs	🟢 97.95%	🟢 98.46%	🟢 0.51%
brush-core/src/shell.rs	🟢 82.27%	🟢 82.4%	🟢 0.13%
Overall Coverage	🟢 76.83%	🟢 76.96%	🟢 0.13%

Minimum allowed coverage is 70%, this run produced 76.96%