[BUG] Dart: Errors ignored in `analysis_options.yaml` do not affect `pana` scanning

[Rexios80]

Bug Report Checklist

• [ ] Have you provided a full/minimal spec to reproduce the issue?
• [ ] Have you validated the input using an OpenAPI validator (example)?
• [ ] Have you tested with the latest master to confirm the issue still exists?
• [x] Have you searched for related issues/PRs?
• [x] What's the actual output vs expected output?
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Description

This PR introduced deprecation annotation support for dart. That's fine, except it ignores the new lint issues by ignoring them in analysis_options.yaml. That would be fine, if pana (the dart package analyzer that awards points on pub.dev) didn't ignore analysis_options.yaml and use its own linter configuration.

openapi-generator version

6.4.0

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Add // ignore: deprecated_member_use_from_same_package to all internal usages of deprecated members during generation

[ahmednfwela]

@jaumard (2018/09) @josh-burton (2019/12) @amondnet (2019/12) @sbu-WBT (2020/12) @kuhnroyal (2020/12) @agilob (2020/12) @ahmednfwela (2021/08)