mutually exclusive handling for warn_error_options and warn_error params in Click CLI

[MichelleArk]

resolves #6579

Description

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue

🎩
(warn_error_options set by user config, warn_error by CLI params)

# profiles.yml
config:
  warn_error_options:
    include:
      - PackageInstallPathDeprecation

❯ python3 core/dbt/cli/main.py --warn-error clean --project-dir ~/src/jaffle_shop
Usage: main.py clean [OPTIONS]
Try 'main.py clean -h' for help.

Error: warn_error_options: not allowed with argument warn_error

(both options set from CLI params)

❯ python3 core/dbt/cli/main.py --warn-error --warn-error-options '{"include": "all"}' clean --project-dir ~/src/jaffle_shop
Usage: main.py clean [OPTIONS]
Try 'main.py clean -h' for help.

Error: warn_error_options: not allowed with argument warn_error

• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[MichelleArk]

effectively a copy from main flags.py: https://github.com/dbt-labs/dbt-core/blob/main/core/dbt/flags.py#L196

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[aranke]

Mostly LGTM, left some comments around making the code more Pythonic.

[aranke]

Discussed comments offline, LGTM!

[iknox-fa]

We probably didn't have to have tests for some of these combos given that Click resolves the cli params and the env var params before we get to this stage in the code-- but I'll never complain about having more tests.

[iknox-fa]

LGTM!