Enable shellcheck in CI

Currently the shellcheck job in CI is disabled. It should be enabled and all issues fixed.

Lines 1576 to 1581 in 7c508c3

    
           # - shellcheck/check: 
        
           #     name: shell-check 
        
           #     # We don't need the `exclude` key as the orb detects the `.shellcheckrc` 
        
           #     dir: . 
        
           #     ignore-dirs: 
        
           #       ./packages/contracts-bedrock/lib

	# - shellcheck/check:
	# name: shell-check
	# # We don't need the `exclude` key as the orb detects the `.shellcheckrc`
	# dir: .
	# ignore-dirs:
	# ./packages/contracts-bedrock/lib