Start remote binary with override entry point

[AndrienkoAleksandr]

What does this PR do?

At this pr I changed a bit model: applied Type field to the model.ChePlugin

Inject remote endpoint binary with override entrypoint sidecar containers. For this purpose we are using init container from che-theia editor-plugin:

initContainers:
  - name: remote-runtime-injector
    image: aandrienko/che-theia-endpoint-runtime-binary:next
    volumes:
      - mountPath: "/remote-endpoint"
        name: remote-endpoint
        ephemeral: true
    env:
      - name: PLUGIN_REMOTE_ENDPOINT_EXECUTABLE
        value: /remote-endpoint/plugin-remote-endpoint
      - name: REMOTE_ENDPOINT_VOLUME_NAME
        value: remote-endpoint

Plugin broker should find this init container by name remote-runtime-injector and only for che-theia editor plugin. Then plugin-broker should analize env variables and volume from init container.

REMOTE_ENDPOINT_VOLUME_NAME env we are using to find one volume which should be shared with other sidecar containers. In this volume init container on start should copy remote binary

PLUGIN_REMOTE_ENDPOINT_EXECUTABLE env will be shared with all sidecar containers.

Also che-plugin-broker override entypoint for all sidecar containers to start remote plugin. But if sidecar container has in the meta.yaml already defined entrypoint che-plugin broker don't override it. It's mean that plugin writer could define do something and then start remote plugin(using env PLUGIN_REMOTE_ENDPOINT_EXECUTABLE).

What issues does this PR fix or reference?

eclipse-che/che#13387

[codecov]

Codecov Report

Merging #75 into master will increase coverage by 0.29%.
The diff coverage is 73.49%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   67.17%   67.46%   +0.29%     
==========================================
  Files           6        7       +1     
  Lines         591      664      +73     
==========================================
+ Hits          397      448      +51     
- Misses        168      181      +13     
- Partials       26       35       +9

Impacted Files	Coverage Δ
brokers/unified/vscode/broker.go	74.21% <100%> (+0.13%)	⬆️
brokers/unified/vscode/sidecar.go	100% <100%> (ø)	⬆️
brokers/unified/broker.go	80.82% <62.5%> (-2.42%)	⬇️
brokers/unified/remote_runtime_injector.go	75.38% <75.38%> (ø)

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[amisevsk]

Looking at this PR vs #76, this one should be closed, right?

[AndrienkoAleksandr]

Looking at this PR vs #76, this one should be closed, right?

Both PRs #76 and #75 works fine, but yes one of them should be closed after discussion.

[AndrienkoAleksandr]

Description updated

[AndrienkoAleksandr]

@amisevsk @davidfestal @sleshchenko @l0rd pr updated and ready for review.

[amisevsk]

LGTM code-wise, but I think we should have test cases for remote runtime injection.

[sleshchenko]

LGTM

[sleshchenko]

EndPoint -> Endpoint