refactor: remove innecessary serde

[drmingdrmer]

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Summary

refactor: remove innecessary serde

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Refactoring

Related Issues

[BohuTANG]

error[E0277]: the trait bound `databend_common_meta_app::background::BackgroundJobParams: background_config::_::_serde::Serialize` is not satisfied
    --> src/query/config/src/background_config.rs:111:32
     |
111  | #[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
     |                                ^^^^^^^^^ the trait `background_config::_::_serde::Serialize` is not implemented for `databend_common_meta_app::background::BackgroundJobParams`
...
117  |     pub params: BackgroundJobParams,
     |     ------------------------------- required by a bound introduced by this call

[drmingdrmer]

error[E0277]: the trait bound `databend_common_meta_app::background::BackgroundJobParams: background_config::_::_serde::Serialize` is not satisfied
    --> src/query/config/src/background_config.rs:111:32
     |
111  | #[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
     |                                ^^^^^^^^^ the trait `background_config::_::_serde::Serialize` is not implemented for `databend_common_meta_app::background::BackgroundJobParams`
...
117  |     pub params: BackgroundJobParams,
     |     ------------------------------- required by a bound introduced by this call

Well... I can see failure notification and has been fixing it, but thank you for reminding.