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**What this PR does / why we need it**: Following https://github.com/grafana/loki/pull/11123 and in order to enable https://github.com/grafana/loki/pull/10417 the query frontend should send the serialized LogQL AST instead of the query string to the queriers. This enables the frontend to change the AST and inject expressions that are not expressible in LogQL. **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [x] Tests updated - [ ] `CHANGELOG.md` updated - [ ] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e3ec) - [ ] If the change is deprecating or removing a configuration option, update the `deprecated-config.yaml` and `deleted-config.yaml` files respectively in the `tools/deprecated-config-checker` directory. [Example PR](0d4416a4b0) --------- Signed-off-by: Callum Styan <callumstyan@gmail.com> Co-authored-by: Callum Styan <callumstyan@gmail.com>