Stop using the native executor

[bkchr]

The native executor is deprecated and also doesn't work together with the new metadata hash (mentioned in the guide https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/guides/enable_metadata_hash/index.html).

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Checklist:

• [ ] I have updated the documentation if necessary.
• [ ] I have added tests to cover my changes, regression test if fixing an issue.
• [ ] This is a breaking change.

[Roznovjak]

Thanks.

[mrq1911]

replaced by #881