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drop shebang from bash completion template

drop shebang from bash completion template: a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: Bash completion script incorrectly includes !/bin/bash shebang line

The task

**Title:** Bash completion script incorrectly includes `#!/bin/bash` shebang line

Part of FineEnvs/repo2rlenv-commit-runtime.