[CI] Use a reusable workflow for regression test #671

Job	Run time
Compilation Test (gcc)	27s
Compilation Test (clang)	30s
Compilation Test (clang-12)	21s
Prepare Test Matrix	1s
Combine Compilation Test Results	1s
Regression Test (b, Bonus Part) / Bonus Part	49s
Regression Test (d, Hardcore) / Hardcore	39s
Regression Test (m, Mandatory Part) / Mandatory Part	1m 8s
Regression Test (ne, Empty Env) / Empty Env	40s
Memory Leak Test (1_groups.sh)	30s
Memory Leak Test (1_operators.sh)	34s
Memory Leak Test (1_wildcards.sh)	47s
Memory Leak Test (2_correction.sh)	1m 35s
Memory Leak Test (3_subshell.sh)	46s
Memory Leak Test (8_syntax_errors.sh)	1m 12s
Memory Leak Test (9_go_wild.sh)	52s
Memory Leak Test (leaks.sh)	1m 9s
Memory Leak Test (0_compare_parsing.sh)	1m 18s
Memory Leak Test (10_parsing_hell.sh)	1m 47s
Memory Leak Test (1_builtins_cd.sh)	52s
Memory Leak Test (1_builtins_echo.sh)	1m 16s
Memory Leak Test (1_builtins_env.sh)	46s
Memory Leak Test (1_builtins_exit.sh)	1m 13s
Memory Leak Test (1_builtins_export.sh)	1m 1s
Memory Leak Test (1_builtins_pwd.sh)	41s
Memory Leak Test (1_builtins_unset.sh)	54s
Memory Leak Test (1_pipelines.sh)	1m 42s
Memory Leak Test (1_redirs.sh)	1m 56s
Memory Leak Test (1_scmds.sh)	54s
Memory Leak Test (1_variables.sh)	1m 18s
Memory Leak Test (2_correction.sh)	1m 35s
Memory Leak Test (2_path_check.sh)	41s
Memory Leak Test (8_syntax_errors.sh)	1m 6s
Memory Leak Test (9_go_wild.sh)	50s
Memory Leak Test (1_segfault.sh)	1m 2s
Memory Leak Test (10_no_env.sh)	1m 0s
Combine Regression Test Results	0s
Combine Memory Leak Test Results	1s
	33m 54s

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