Fix bug with handling server types and add new Hetzner server types

[adoi]

What this PR does / why we need it:
Fixes handling Hetzner server types. When no error was returned while we were running prowjobs in Hetzner, Hetzner client was returning a nil server type, we had no check for this, which later resulted in test failures after Hetzner had deprecated support for cx11 server types.

This pr also adds cx22 to server types for our e2e tests, after Hetzner deprecation of cx11: https://docs.hetzner.com/cloud/servers/deprecated-plans/

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?

/kind bug
/kind chore

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

NONE

Documentation:

NONE

[kubermatic-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[adoi]

/test pull-machine-controller-e2e-hetzner

[adoi]

/test pull-machine-controller-e2e-hetzner

[xrstf]

/approve
/lgtm

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xrstf

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[kubermatic-bot]

LGTM label has been added.

Git tree hash: 4b4a05e9aef74c19184e698251f797753b0fdb52

[ahmedwaleedmalik]

/cherry-pick release/v1.60

[kubermatic-bot]

@ahmedwaleedmalik: new pull request created: #1884

In response to this:

/cherry-pick release/v1.60

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ahmedwaleedmalik]

/cherry-pick release/v1.59

[ahmedwaleedmalik]

/cherry-pick release/v1.58

[kubermatic-bot]

@ahmedwaleedmalik: #1877 failed to apply on top of branch "release/v1.59":

Applying: test hetzner e2e test
Using index info to reconstruct a base tree...
M	pkg/cloudprovider/provider/hetzner/provider.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/cloudprovider/provider/hetzner/provider.go
CONFLICT (content): Merge conflict in pkg/cloudprovider/provider/hetzner/provider.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 test hetzner e2e test
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release/v1.59

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[kubermatic-bot]

@ahmedwaleedmalik: #1877 failed to apply on top of branch "release/v1.58":

Applying: test hetzner e2e test
Using index info to reconstruct a base tree...
M	pkg/cloudprovider/provider/hetzner/provider.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/cloudprovider/provider/hetzner/provider.go
CONFLICT (content): Merge conflict in pkg/cloudprovider/provider/hetzner/provider.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 test hetzner e2e test
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release/v1.58

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ahmedwaleedmalik]

I don't really know if this is required for 1.59 and 1.58 or not. For now, we just need this for #1883