feat(topology): remove usage of k8s plugin from topology & tekton plugins

[debsmita1]

Resolves:
https://issues.redhat.com/browse/RHIDP-3126

• Replaced dependency@backstage/plugin-kubernetes with @backstage/plugin-kubernetes-react
• Replicated useKubernetesObjects hook from Backstage upstream to remove dependency on k8s plugin
• created separated api refs for topology and tekton to avoid duplicate plugin id error

[openshift-ci]

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[invincibleJai]

/cc @its-mitesh-kumar
/cc @divyanshiGupta

[divyanshiGupta]

@debsmita1 can you check if the yarn.lock is being updated correctly as to me it seems most of the current changes to it are not required since you are only adding "@backstage/plugin-kubernetes-react" and removing "@backstage/plugin-kubernetes" so only these and related dependencies should get updated. I tried adding this "@backstage/plugin-kubernetes-react" dependency and for me only this "@backstage/plugin-kubernetes-react" and "@backstage/plugin-kubernetes-common" got updated in yarn.lock.

[divyanshiGupta]

@debsmita1 we need to update tekton and topology plugins README since we are not using "@backstage/plugin-kubernetes" anymore and the README mentions it.

[karthikjeeyar]

Importing utils from this shared library @backstage/plugin-kubernetes-react still doesn't make tekton and topology plugins work independently without @backstage/plugin-kubernetes frontend plugin (which registers the KubernetesProxyApi into backstage application).

So this @backstage/plugin-kubernetes is still a pre-requisite for the topology and tekton users.

[karthikjeeyar]

Thanks @debsmita1. Nice work! Verified locally, it works as expected without the dependancy of kubernetes frontend plugin.

tekton_topology_without_k8s_frontend.mov

[jerolimov]

/cc