Revert "Add DEVFILE_REGISTRY env var for periodic tests (#6709)"

[valaparthvi]

This reverts commit f0bf9ee.

What type of PR is this:
/area testing

What does this PR do / why we need it:
PR #6709 modified the periodic tests to use the Devfile registry setup on IBM cloud because of the broken Staging Registry. But it would be helpful to have our tests use the Staging Registry in order to catch any problem with it early on before it propagates to the Production Registry.

This PR reverts back to using the Staging Registry.

Which issue(s) this PR fixes:

Fixes #

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:

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[feloy]

Thanks @valaparthvi for taking this over
/lgtm

[odo-robot]

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[odo-robot]

Windows Tests (OCP) on commit 30d6cbe finished with errors.
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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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0.3% Duplication

[rm3l]

Thanks.

[rm3l]

 V  Creating resource Service/my-cs 
  [odo] 
  [odo] Your Devfile has been successfully deployed
  Running oc.exe with args [oc get deployment -n cmd-delete-test434enl] and odo env: []
  [oc] Unable to connect to the server: dial tcp 161.156.12.82:31700: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
  [FAILED] in [BeforeEach] - C:/Users/Administrator.ANSIBLE-TEST-VS/3673/tests/helper/helper_oc.go:34 @ 04/12/23 05:23:51.321
  Deleting project: cmd-delete-test434enl
  Running oc.exe with args [oc delete project cmd-delete-test434enl --wait=false] and odo env: []
...
Summarizing 1 Failure:
  [FAIL] odo delete command tests when a component is bootstrapped using a devfile.yaml with URI-referenced Kubernetes components when the component is deployed in DEPLOY mode [BeforeEach] when the component is deleted using its name and namespace from another directory should output that there are no resources to be deleted
  C:/Users/Administrator.ANSIBLE-TEST-VS/3673/tests/helper/helper_oc.go:34

Ran 432 of 800 Specs in 1098.125 seconds
FAIL! -- 431 Passed | 1 Failed | 0 Pending | 368 Skipped

Not related.

/override windows-integration-test/Windows-test

[openshift-ci]

@rm3l: Overrode contexts on behalf of rm3l: windows-integration-test/Windows-test

In response to this:

V  Creating resource Service/my-cs 
 [odo] 
 [odo] Your Devfile has been successfully deployed
 Running oc.exe with args [oc get deployment -n cmd-delete-test434enl] and odo env: []
 [oc] Unable to connect to the server: dial tcp 161.156.12.82:31700: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
 [FAILED] in [BeforeEach] - C:/Users/Administrator.ANSIBLE-TEST-VS/3673/tests/helper/helper_oc.go:34 @ 04/12/23 05:23:51.321
 Deleting project: cmd-delete-test434enl
 Running oc.exe with args [oc delete project cmd-delete-test434enl --wait=false] and odo env: []
...
Summarizing 1 Failure:
 [FAIL] odo delete command tests when a component is bootstrapped using a devfile.yaml with URI-referenced Kubernetes components when the component is deployed in DEPLOY mode [BeforeEach] when the component is deleted using its name and namespace from another directory should output that there are no resources to be deleted
 C:/Users/Administrator.ANSIBLE-TEST-VS/3673/tests/helper/helper_oc.go:34

Ran 432 of 800 Specs in 1098.125 seconds
FAIL! -- 431 Passed | 1 Failed | 0 Pending | 368 Skipped

Not related.

/override windows-integration-test/Windows-test

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