fix: use electron browser in cypress [release-4.18]

[ronlavi2412]

Summary

• Change cypress run --browser chrome → cypress run --browser electron in package.json

Why this is a prerequisite

On release-4.18, test-prow-e2e.sh calls yarn run cypress, which maps to the cypress npm script. CI currently works because this branch still uses tectonic-console-builder-v24, which ships Chrome.

However, openshift/release#82053 will bump this branch to tectonic-console-builder-v29 (which does not ship Chrome). This PR must merge before openshift/release#82053 — otherwise CI on release-4.18 will fail with the same error already seen on release-4.19:

Browser: chrome was not found on your system or is not supported by Cypress.
Available browsers found on your system are:
 - electron

Background

release-4.19 is currently broken because it was accidentally bumped to v29 by openshift/release#78488 (a networking-console-plugin migration that inadvertently touched nmstate CI config). openshift/release#82053 standardizes all remaining branches to v29 intentionally. This fix ensures release-4.18 is ready.

Companion PRs

CI builder standardization (openshift/release): openshift/release#82053

This series (all branches):

Branch	PR	Role
release-4.19	#263	Urgent — fixes active CI failure
release-4.21	#264	Consistency — CI already uses electron
release-4.22	#265	Consistency — CI already uses electron
main	#266	Consistency — CI already uses electron
release-4.20	#267	Prerequisite — must merge before openshift/release#82053
release-4.18	#268	Prerequisite — must merge before openshift/release#82053
release-4.17	#269	Prerequisite — must merge before openshift/release#82053

Test plan

• CI on release-4.18 continues to pass after fix: bump nmstate-console-plugin release-4.17/4.18/4.20 to tectonic-console-builder-v29 release#82053 merges

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@ronlavi2412: all tests passed!

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[Parthivk100]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Parthivk100, ronlavi2412

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