fix(ci): Homebrew cask ships no shell completions

[khvn26]

brew install Flagsmith/tap/flagsmith installs a working CLI, but every completion script fails to generate:

Failed to generate bash completions from /opt/homebrew/Caskroom/flagsmith/2.0.0/flagsmith:
Failure while executing; `{"SHELL" => "bash"} .../flagsmith completion completion bash`
was terminated by uncaught signal KILL.

In this PR, we fix two failures contributing to the error:

1. shell_parameter_format: cobra already makes Homebrew pass completion <shell> (Library/Homebrew/utils/shell_completion.rb), so our own args: [completion] produces flagsmith completion completion bash. That prints the help text and generates nothing.
2. The binary is still quarantined when the completions are generated.

Verification

goreleaser release --snapshot now emits preflight do and a bare generate_completions_from_executable "flagsmith". Installing that cask through a scratch local tap gives a clean install with no warnings and all three files present:

• /opt/homebrew/share/zsh/site-functions/_flagsmith
• /opt/homebrew/etc/bash_completion.d/flagsmith
• /opt/homebrew/share/fish/vendor_completions.d/flagsmith.fish

The quarantine half is directly reproducible:

$ xattr -w com.apple.quarantine "0081;00000000;Safari;" flagsmith && ./flagsmith completion bash
Killed: 9
$ xattr -d com.apple.quarantine flagsmith && ./flagsmith completion bash    # exit 0

Both faults go away for good once we notarise the macOS binaries (#85), at which point the un-quarantine hook can be dropped entirely.

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