test_driver: support RestoreStringWithoutCharset

[wziww]

What problem does this PR solve?

Let test_driver support for https://github.com/pingcap/parser/pull/1184

Check List

Tests

• Unit test
• Integration test

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[kennytm]

Hi,

The code of this repository in the master branch has been integrated back into https://github.com/pingcap/tidb. This repository is maintained for backporting to older release branches only. Could you submit the PR there instead? Thanks.

[wziww]

ok