Automatic merge from submit-queue (batch tested with PRs 49342, 50581, 50777)
apimachinery: Print unknown transport type
The current error message prints a pointer value rather than the actual
type, which is really not useful.
e.g.:
```
# Old:
unknown transport type: &{0xc42044a7b0 0xc4208d6dc0}
# New:
unknown transport type: *gcp.conditionalTransport
```
**What this PR does / why we need it**: Makes an error message more useful.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: related to #50775
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
External Repository Staging Area
This directory is the staging area for packages that have been split to their own repository. The content here will be periodically published to respective top-level k8s.io repositories.
Repositories currently staged here:
k8s.io/apiextensions-apiserverk8s.io/apik8s.io/apimachineryk8s.io/apiserverk8s.io/client-gok8s.io/kube-aggregatork8s.io/kube-gen(about to be published)k8s.io/metricsk8s.io/sample-apiserver
The code in the staging/ directory is authoritative, i.e. the only copy of the code. You can directly modify such code.
Using staged repositories from Kubernetes code
Kubernetes code uses the repositories in this directory via symlinks in the
vendor/k8s.io directory into this staging area. For example, when
Kubernetes code imports a package from the k8s.io/client-go repository, that
import is resolved to staging/src/k8s.io/client-go relative to the project
root:
// pkg/example/some_code.go
package example
import (
"k8s.io/client-go/dynamic" // resolves to staging/src/k8s.io/client-go/dynamic
)
Once the change-over to external repositories is complete, these repositories
will actually be vendored from k8s.io/<package-name>.