feat(gcp): add example for gcp

[haarchri]

Description of your changes

• add example for gcp

Fixes #

I have:

• Read and followed Upbound's contribution process.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR, as appropriate.

How has this code been tested

uptest

crossplane beta trace xspace hostcluster-gcp-nhmzs
I0229 12:42:27.652973   20217 request.go:697] Waited for 1.042421208s due to client-side throttling, not priority and fairness, request: GET:https://127.0.0.1:57923/apis/cloudplatform.gcp.upbound.io/v1beta1?timeout=32s
NAME                                                     SYNCED   READY   STATUS      
XSpace/hostcluster-gcp-nhmzs                             True     True    Available   
├─ Usage/hostcluster-gcp-nhmzs-dz9w4                     -        True    Available   
├─ Usage/hostcluster-gcp-nhmzs-qgdxf                     -        True    Available   
├─ XCluster/hostcluster-gcp-nhmzs-j2npg                  True     True    Available   
│  ├─ XGKE/hostcluster-gcp-nhmzs-jkjv4                   True     True    Available   
│  │  ├─ ProjectIAMMember/hostcluster-gcp-nhmzs-9xnpt    True     True    Available   
│  │  ├─ ServiceAccountKey/hostcluster-gcp-nhmzs-68crc   True     True    Available   
│  │  ├─ ServiceAccount/hostcluster-gcp-nhmzs-9w9xz      True     True    Available   
│  │  ├─ Cluster/hostcluster-gcp-nhmzs-d52dh             True     True    Available   
│  │  ├─ NodePool/hostcluster-gcp-nhmzs-p8vxl            True     True    Available   
│  │  ├─ ProviderConfig/hostcluster-gcp                  -        -                   
│  │  └─ ProviderConfig/hostcluster-gcp                  -        -                   
│  └─ XNetwork/hostcluster-gcp-nhmzs-htlvs               True     True    Available   
│     ├─ Network/hostcluster-gcp                         True     True    Available   
│     └─ Subnetwork/hostcluster-gcp-nhmzs-9zzzg          True     True    Available   
├─ XCore/hostcluster-gcp-nhmzs-lc8cp                     True     True    Available   
│  └─ Release/hostcluster-gcp-nhmzs-dg59r                True     True    Available   
└─ XInit/hostcluster-gcp-nhmzs-78k9c                     True     True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-2jgcm                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-2mps8                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-9kn9v                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-cdwcr                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-hgrjg                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-k9jb9                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-mwfcd                  -        True    Available   
   ├─ Usage/hostcluster-gcp-nhmzs-r5mz2                  -        True    Available   
   ├─ Release/hostcluster-gcp-nhmzs-bhq85                True     True    Available   
   ├─ Release/hostcluster-gcp-nhmzs-hwlqf                True     True    Available   
   ├─ Release/hostcluster-gcp-nhmzs-lbf2t                True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-8p2cq                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-x9nn7                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-54p7j                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-55q7c                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-9ccpp                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-cwdzx                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-q42xb                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-sn2hd                 True     True    Available   
   ├─ Object/hostcluster-gcp-nhmzs-t5vg2                 True     True    Available   
   └─ Object/hostcluster-gcp-nhmzs-zbw6h                 True     True    Available   

[haarchri]

/test-examples="examples/gcp-host-space.yaml"