Refactor --output help text and deprecate --file.

[sharief007]

Change Log

• Added usage syntax to CLI help text for --output option for better understanding. The new help text looks like:

-o, --output stringArray       report output format (<format>=<file> to output to a file), formats=[syft-json github-json syft-table syft-text template cyclonedx-xml cyclonedx-json spdx-tag-value spdx-json] (default [syft-table])

• Marked the --file option as deprecated, suggesting to use --output as an alternative. The new help text looks like:

--file string              file to write the default report output to (default is STDOUT) (DEPRECATED: use: output)  

Resolves: #2165

[kzantow]

To fix the static analysis check, you can run make lint-fix

[kzantow]

LGTM 👍