chore: show a deprecation notice for --scanners config

[knqyf263]

Description

It shows a warning message to encourage users to migrate to --scanners misconfig.

$ trivy repo --scanners config .
2023-11-15T11:35:57.027+0900    WARN    '--scanner config' is deprecated. Use '--scanner misconfig' instead. See https://github.com/aquasecurity/trivy/discussions/5586 for the detail.
2023-11-15T11:35:57.036+0900    INFO    Misconfiguration scanning is enabled

Related PRs

• feat: add aliases to '--scanners' #5558

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[simar7]

🚢 it!

[DmitriyLewen]

LGTM