feat: configure securityContext for che-gateway container

[tolusha]

What does this PR do?

feat: configure securityContext for che-gateway container

What issues does this PR fix or reference?

eclipse-che/che#22747

Is it tested? How?

1. Configure CheCluster

spec:
  devEnvironments:
    security:
      containerSecurityContext:
        <...>

2. Start a workspace
3. Check security context in the gateway container

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[dkwon17]

Can we move this check

				workspace.Config.Workspace != nil &&
				workspace.Config.Workspace.ContainerSecurityContext != nil

to the outer if statement on line 61 ?

[ibuziuk]

@tolusha looks like there is a test failure
Also, wondering if we can add a test case for the SecurityContext as well?

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dkwon17, tolusha

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[dkwon17]

For the sake of the DWO 0.32.0 release, I propose we add the test in a future PR. Currently, there doesn't seem to be any test suites that specifically tests the routing.go file: https://github.com/devfile/devworkspace-operator//blob/69643bf91b2594795949e149c4b89ae1e1b49832/pkg/provision/workspace/routing.go

[dkwon17]

@ibuziuk the test failure was due to flakiness, after rerunning the tests, all have passed