feat(discoveryengine): start generating apiv1beta (#7427)

discoveryengine/CHANGES.md

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+# Changes

discoveryengine/README.md

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+# Discovery Engine API
+
+[![Go Reference](https://pkg.go.dev/badge/cloud.google.com/go/discoveryengine.svg)](https://pkg.go.dev/cloud.google.com/go/discoveryengine)
+
+Go Client Library for Discovery Engine API.
+
+## Install
+
+```bash
+go get cloud.google.com/go/discoveryengine
+```
+
+## Stability
+
+The stability of this module is indicated by SemVer.
+
+However, a `v1+` module may have breaking changes in two scenarios:
+
+* Packages with `alpha` or `beta` in the import path
+* The GoDoc has an explicit stability disclaimer (for example, for an experimental feature).
+
+## Google Cloud Samples
+
+To browse ready to use code samples check [Google Cloud Samples](https://cloud.google.com/docs/samples?l=go).
+
+## Go Version Support
+
+See the [Go Versions Supported](https://github.com/googleapis/google-cloud-go#go-versions-supported)
+section in the root directory's README.
+
+## Authorization
+
+See the [Authorization](https://github.com/googleapis/google-cloud-go#authorization)
+section in the root directory's README.
+
+## Contributing
+
+Contributions are welcome. Please, see the [CONTRIBUTING](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/main/CONTRIBUTING.md)
+document for details.
+
+Please note that this project is released with a Contributor Code of Conduct.
+By participating in this project you agree to abide by its terms. See
+[Contributor Code of Conduct](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/main/CONTRIBUTING.md#contributor-code-of-conduct)
+for more information.