[BUG] OIDC cypress tests failing due to upstream change

[derek-ho]

What is the bug?
Example run: https://github.com/opensearch-project/security-dashboards-plugin/actions/runs/8896012606/job/24429085541?pr=1762 - upstream changes introduced new components which makes the OIDC cypress test fail on finding "Dev Tools" header. The test needs to be changed to assert on data-test-subj to avoid upstream changes breaking us.

How can one reproduce the bug?
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4. See error

What is the expected behavior?
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What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

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[derek-ho]

PR necessary because of: https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6553/files