Improve error reporting in project clone

[amisevsk]

What does this PR do?

• Never restart the project-clone container since it's not re-entrant. Instead, log output to a file and copy it into $PROJECTS_ROOT if an error occurs.
• Run git reset --hard after checking out a branch to emulate git's behavior in (misconfigured?) git repos such as https://github.com/che-samples/java-spring-petclinic/tree/devfilev2 (.vscode/extensions is commited to the repo and .gitignored, which causes go-git to ignore it even for git reset)

What issues does this PR fix or reference?

Closes #457

Is it tested? How?

• Update RELATED_IMAGE_project_clone in a DWO deployment to quay.io/amisevsk/project-clone:error-reporting
• Create a devworkspace to test error reporting:

  cat <<EOF | kubectl apply -f -
  kind: DevWorkspace
  apiVersion: workspace.devfile.io/v1alpha2
  metadata:
    name: test-dw
  spec:
    started: true
    template:
      projects:
      - name: dwo
        git:
          checkoutFrom:
            remote: amisevsk
            revision: non-existent-branch
          remotes:
            amisevsk: https://github.com/amisevsk/devworkspace-operator.git
            origin: https://github.com/devfile/devworkspace-operator.git
            sleshchenko: https://github.com/sleshchenko/devworkspace-operator.git
      components:
        - name: theia
          plugin:
            uri: https://che-plugin-registry-main.surge.sh/v3/plugins/eclipse/che-theia/next/devfile.yaml
  EOF

  • /projects should contain a file named project-clone-errors.log after workspace is started
• Create a devworkspace to test reset behaviour:

  cat <<EOF | kubectl apply -f -
  kind: DevWorkspace
  apiVersion: workspace.devfile.io/v1alpha2
  metadata:
    name: test-dw
  spec:
    started: true
    template:
      projects:
      - name: spring-petclinic
        git:
          checkoutFrom:
            revision: devfilev2
          remotes:
            origin: https://github.com/che-samples/spring-petclinic
      components:
        - name: theia
          plugin:
            uri: https://che-plugin-registry-main.surge.sh/v3/plugins/eclipse/che-theia/next/devfile.yaml
  EOF

  • Project's git state should be clean.

PR Checklist

• E2E tests pass (when PR is ready, comment /test v7-devworkspaces-operator-e2e, v7-devworkspace-happy-path to trigger)
  • v7-devworkspaces-operator-e2e: DevWorkspace e2e test
  • v7-devworkspace-happy-path: DevWorkspace e2e test

[sleshchenko]

I haven't tested but changes LGTM

[JPinkney]

LGTM

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amisevsk, JPinkney, sleshchenko

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [JPinkney,amisevsk,sleshchenko]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[amisevsk]

/test v7-devworkspaces-operator-e2e, v7-devworkspace-happy-path