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### Description
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This PR is an incremental work towards [enabling insert mutations on MSSQL](https://github.com/hasura/graphql-engine-mono/pull/1974). In this PR, we generate insert mutation schema parser for MSSQL backend.
### Changelog
- [ ] `CHANGELOG.md` is updated with user-facing content relevant to this PR. If no changelog is required, then add the `no-changelog-required` label.
### Affected components
- [x] Server
https://github.com/hasura/graphql-engine-mono/pull/2141
GitOrigin-RevId: 8595008dece35f7fded9c52e134de8b97b64f53f