NO-JIRA: tests(browser/): add Cypress section to the README.md

[jiridanek]

Description

It's a start.

We should eventually take look into https://issues.redhat.com/browse/RHOAIENG-8378 and decide how these pieces fit together. cc @caponetto.

How Has This Been Tested?

I did manage to make something work e2e, with elyra in a workbench on OpenShift AI. These are essentially my wip-notes.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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