Make sure to use random component names when copying sample Devfiles in integration tests

[rm3l]

What type of PR is this:
/kind tests
/area testing

What does this PR do / why we need it:
This updates the helper.CopyExampleDevfile function to accept a parameter that allows performing operations on the destination Devfile (like setting its metadata.name). This way, callers are able to pass a unique random component name.
Using a random name helps prevent conflicts when isolation is not possible (for example on Podman). This will allow fixing the Podman tests in #6499.

For consistency, the next step could be not to use odo init --devfile-path /path/to/example/devfile (so as not to depend on the odo init command), but instead rely on the updated helper.CopyExampleDevfile function everywhere. But this can be done in a subsequent PR.

Which issue(s) this PR fixes:
—

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:

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[rm3l]

• [FAILED] [255.311 seconds]
E2E Test
/go/odo_1/tests/e2escenarios/e2e_test.go:19
  starting with non-empty Directory
  /go/odo_1/tests/e2escenarios/e2e_test.go:164
    [It] should verify developer workflow from non-empty Directory
    /go/odo_1/tests/e2escenarios/e2e_test.go:169
...
error while trying to GET "127.0.0.1:42467": Get "[http://127.0.0.1:42467":](http://127.0.0.1:42467%22/) EOF
    [odo] E0118 10:05:23.849776   12130 portforward.go:406] an error occurred forwarding 42467 -> 3000: error forwarding port 3000 to pod 04b08dc65d7d03a38fb0d94d02bf2a4652eb2e0910017dbd85d9338c899cf992, uid : port forward into network namespace "/var/run/netns/1b65695b-3aaf-4fe2-b6d0-01d61dec48da": failed to connect to localhost:3000 inside namespace 04b08dc65d7d03a38fb0d94d02bf2a4652eb2e0910017dbd85d9338c899cf992: dial tcp [::1]:3000: connect: connection refused
    [odo] E0118 10:05:23.850002   12130 portforward.go:234] lost connection to pod
    [odo]  -  Forwarding from 127.0.0.1:44475 -> 3000
...

Summarizing 1 Failure:
  [FAIL] E2E Test starting with non-empty Directory [It] should verify developer workflow from non-empty Directory
  /go/odo_1/tests/e2escenarios/e2e_test.go:41

/override OpenShift-Integration-tests/OpenShift-Integration-tests

Flaky E2E test (reported in #6463 )

[openshift-ci]

@rm3l: Overrode contexts on behalf of rm3l: OpenShift-Integration-tests/OpenShift-Integration-tests

Details

In response to this:

• [FAILED] [255.311 seconds]
E2E Test
/go/odo_1/tests/e2escenarios/e2e_test.go:19
 starting with non-empty Directory
 /go/odo_1/tests/e2escenarios/e2e_test.go:164
   [It] should verify developer workflow from non-empty Directory
   /go/odo_1/tests/e2escenarios/e2e_test.go:169
...
error while trying to GET "127.0.0.1:42467": Get "[http://127.0.0.1:42467":](http://127.0.0.1:42467%22/) EOF
   [odo] E0118 10:05:23.849776   12130 portforward.go:406] an error occurred forwarding 42467 -> 3000: error forwarding port 3000 to pod 04b08dc65d7d03a38fb0d94d02bf2a4652eb2e0910017dbd85d9338c899cf992, uid : port forward into network namespace "/var/run/netns/1b65695b-3aaf-4fe2-b6d0-01d61dec48da": failed to connect to localhost:3000 inside namespace 04b08dc65d7d03a38fb0d94d02bf2a4652eb2e0910017dbd85d9338c899cf992: dial tcp [::1]:3000: connect: connection refused
   [odo] E0118 10:05:23.850002   12130 portforward.go:234] lost connection to pod
   [odo]  -  Forwarding from 127.0.0.1:44475 -> 3000
...

Summarizing 1 Failure:
 [FAIL] E2E Test starting with non-empty Directory [It] should verify developer workflow from non-empty Directory
 /go/odo_1/tests/e2escenarios/e2e_test.go:41

/override OpenShift-Integration-tests/OpenShift-Integration-tests

Flaky E2E test (reported in #6463 )

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[rm3l]

/test v4.11-integration-e2e

Tests failing due to user no longer being authenticated.

    Running oc with args [oc get pods -n cmd-describe-list-binding-test581wmo -o jsonpath='{range .items[*]}{.metadata.name}'] and odo env: []
    [oc] error: You must be logged in to the server (Unauthorized)
...
    Running oc with args [oc get pods --namespace cmd-dev-test458zqh --selector=component=zumcbf -o jsonpath={.items[*].metadata.name}] and odo env: []
    [oc] zumcbf-app-6bff8dfbb9-zphp4Running oc with args [oc exec zumcbf-app-6bff8dfbb9-zphp4 --namespace cmd-dev-test458zqh -c runtime -- cat /projects/server.js] and odo env: []
    [odo] Error connecting to the cluster. Please log in again
    [odo] 
    [odo] I0118 13:57:42.390774   34324 watch.go:465] Error from Push: watch command was unable to push component: unable to determine if component zumcbf exists: unable to get Deployments for the selector: app.kubernetes.io/instance=zumcbf,app.kubernetes.io/managed-by=odo,app.kubernetes.io/part-of=app,component=zumcbf,odo.dev/mode=Dev: unable to list Deployments: Unauthorized
    [oc] error: You must be logged in to the server (Unauthorized)
    [odo] I0118 13:57:42.393747   34324 backo.go:23] wait for 100ms
    [odo] read: read /dev/stdin: input/output error
    [odo] Cleaning resources, please wait
...