impl(compute/v1): add Operation::to_result() (#3581)

We cannot convert `Operation` to `gax::error::Error` without data loss.
This introduces a new error type to handle "the operation completed with
an error", and a helper function to convert such as operation to errors.

Author: coryan

.github/workflows/sdk.yaml

@@ -595,7 +595,7 @@ jobs:
           sudo unzip -x /tmp/protoc.zip
           protoc --version
       - name: Regenerate all the code
-        run: go run github.com/googleapis/librarian/cmd/[email protected].20251017142006-14a148302470 refreshall
+        run: go run github.com/googleapis/librarian/cmd/[email protected].20251020204149-2c94a53f0fb5 refreshall
       - run: cargo fmt
         # If there is any difference between the generated code and the
         # committed code that is an error. All the inputs should be pinned,

src/generated/cloud/compute/v1/.sidekick.toml

@@ -44,8 +44,8 @@ version                   = '0.2.0'
 copyright-year            = '2025'
 package-name-override     = 'google-cloud-compute-v1'
 per-service-features      = 'true'
-default-features          = 'instances'
-extra-modules             = 'operation'
+default-features          = 'instances,projects'
+extra-modules             = 'errors,operation'
 'package:lro'             = 'force-used=true,package=google-cloud-lro'
 'package:rpc'             = 'force-used=true,package=google-cloud-rpc'
 disabled-rustdoc-warnings = "bare_urls,broken_intra_doc_links,redundant_explicit_links"

src/generated/cloud/compute/v1/Cargo.toml

@@ -29,6 +29,7 @@ rust-version.workspace = true
 [features]
 default = [
     "instances",
+    "projects",
 ]
 # Enables `client::AcceleratorTypes` and all the types it depends on.
 accelerator-types = []