🌱 Go Code Update (pre capi v1.11 (beta2))

[guettli]

This PR contains changes which were back-ported to v1.1.x (beta1, pre beta2)

Changes to tooling are in the next PR: #1771

Purpose: This PR updates Go code in the cluster-api-provider-hetzner repository in preparation for compatibility with the branch for ✨ v1.2.x with APIVersion v1beta2 by guettli · Pull Request #1760 · syself/cluster-api-provider-hetzner.

Changes:

• Elaborate docs for HostReadyCondition
• Use new hcloud server types (cpxN1 --> cpxN2)
• Elaborate docs for InstallImage
• Controller EnvTests: Show start of test, if DEBUG is set.
• Fixed flaky unit-tests by waiting for HCloudBootStateOperatingSystemRunning
• Fixed flaky unit-tests by wrapping Update() into a Eventually()
• Removed not needed named return values (actionContinue Result())
• Simplified code by using early-return (near if reflect.DeepEqual(oldHost, s.scope.HetznerBareMetalHost) {)
• On conflict, requeueAfter 1s to avoid stale cache reads.
• Fix error during delete hbmh (near msg := "server not found in Robot API during deprovisioning, assuming already removed")
• show serverType and location if createServer fails (near msg := fmt.Sprintf("failed to create HCloud server %q in %q (type %q)",)
• Set logLevel to Debug, when env var DEBUG is set.