[AOT compatible] Clean up some AOT build issue in PowerAccent.Core

[moooyo]

Summary of the Pull Request

PR Checklist

• Closes: #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
  manual test passed in my local env
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[moooyo]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[moooyo]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jaimecbernardo]

Hi, we've added the "Don't Merge" tag to the PR, since we're trying to keep the repo stable for the release and possible hotfix if necessary. Please don't merge the PR while the tag is still in here. This allows people to review the PR and approve with less fear that it'll get merged 😄