Fix e2e test module component versions

[mihaialexandrescu]

Description

Currently, the tests/e2e module introduced dependencies on k8s components from v0.27.2 instead of the v0.26.4 we have in the other modules of this repo.

Beyond not being in line with the supported k8s versions, this introduced a problem visible in testing (make test) and importing certain packages (e.g. some of our own packages even from this repo like pkg/webhooks):

# sigs.k8s.io/controller-runtime/pkg/cache
../../../../pkg/mod/sigs.k8s.io/[email protected]/pkg/cache/multi_namespace_cache.go:308:9: cannot use handles (variable of type map[string]"k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration) as "k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration value in return statement: map[string]"k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration does not implement "k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration (missing method HasSynced)
../../../../pkg/mod/sigs.k8s.io/[email protected]/pkg/cache/multi_namespace_cache.go:321:9: cannot use handles (variable of type map[string]"k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration) as "k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration value in return statement: map[string]"k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration does not implement "k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration (missing method HasSynced)
../../../../pkg/mod/sigs.k8s.io/[email protected]/pkg/cache/multi_namespace_cache.go:326:17: impossible type assertion: h.(map[string]toolscache.ResourceEventHandlerRegistration)
	map[string]"k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration does not implement "k8s.io/client-go/tools/cache".ResourceEventHandlerRegistration (missing method HasSynced)
make: *** [vet] Error 1

That turns out to be a common issue when upgrading to modules that depend on client-go >v0.27.0 and is described succinctly here and here.
The gist of it is (remember we are currently in v0.26.4 in our other modules):

The type ResourceEventHandlerRegistration is added to client-go from v0.26.0. But it is different with 0.27.0.

0.26.0:
type ResourceEventHandlerRegistration interface{}

0.26.4
type ResourceEventHandlerRegistration interface{}

0.27.0
type ResourceEventHandlerRegistration interface {
// HasSynced reports if both the parent has synced and all pre-sync
// events have been delivered.
HasSynced() bool
}

For this PR, I removed all the require stanzas that had only indirect dependencies in them from tests/e2e/go.mod and then ran go mod tidy on the tests/e2e module. Then I did a go mod tidy on the root module, too.

Additionally, I am upgrading the koperator and koperator/api dependencies to the latest non-dev releases (at the time of writing).

Additionally, I am upgrading the patch version of Terratest because ... it's available and it didn't cause any other dependency changes.

Type of Change

• Other (please describe): dependency modification (mostly downgrade)

Checklist

• I have read the contributing guidelines
• All code style checks pass
• All new and existing tests pass

[mihaialexandrescu]

As part of this PR, would we also want to downgrade the go version in the tests/e2e/go.mod file from 1.20 to 1.19 (like we have in all other modules in this repo) ?

I don't think it's a must do functionally since eventually every other module would catch up eventually and the tests/e2e module only imports others from this repo (but it isn't imported by others).

|> % grep -irn '^go 1.[0-9][0-9]$' 
./go.mod:3:go 1.19
./tests/e2e/go.mod:3:go 1.20   <<
./properties/go.mod:3:go 1.19
./api/go.mod:3:go 1.19

Later edit: we agreed to downgrade to keep consistency -> done in 46c15b9