[stable24] Make cypress CI faster

[juliusknorr]

• Reenable multiple cypress ocntainers
• No need to build viewer anymore
• Add one more container

Backport of #2494

[juliusknorr]

Seems we have a bit of a flaky test on stable24:

@vinicius73 @max-nextcloud Does one of you remember a fix on master that we might be able to backport?

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1. Workspace
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   callouts
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   toggle callouts:
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   CypressError: Timed out retrying after 10050ms: cy.click() failed because this element is not visible:
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   <button data-v-6469f3d2="" class="icon-info has-tooltip" data-original-title="null"></button>
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   This element <button.icon-info.has-tooltip> is not visible because its parent <div.submenu> has CSS property: visibility: hidden
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   Fix this problem, or use {force: true} to disable error checking.
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   https://on.cypress.io/element-cannot-be-interacted-with
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   at runVisibilityCheck (http://localhost:8081/__cypress/runner/cypress_runner.js:168718:76)
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   at $Cy.ensureStrictVisibility (http://localhost:8081/__cypress/runner/cypress_runner.js:168734:12)
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   at runAllChecks (http://localhost:8081/__cypress/runner/cypress_runner.js:154692:14)
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   at retryActionability (http://localhost:8081/__cypress/runner/cypress_runner.js:154747:16)
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   at tryCatcher (http://localhost:8081/__cypress/runner/cypress_runner.js:13022:23)
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   at Function.Promise.attempt.Promise.try (http://localhost:8081/__cypress/runner/cypress_runner.js:10296:29)
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   at whenStable (http://localhost:8081/__cypress/runner/cypress_runner.js:173817:65)
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   at http://localhost:8081/__cypress/runner/cypress_runner.js:173272:14
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   at tryCatcher (http://localhost:8081/__cypress/runner/cypress_runner.js:13022:23)
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   at Promise._settlePromiseFromHandler (http://localhost:8081/__cypress/runner/cypress_runner.js:10957:31)
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   at Promise._settlePromise (http://localhost:8081/__cypress/runner/cypress_runner.js:11014:18)
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   at Promise._settlePromise0 (http://localhost:8081/__cypress/runner/cypress_runner.js:11059:10)
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   at Promise._settlePromises (http://localhost:8081/__cypress/runner/cypress_runner.js:11139:18)
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   at Promise._fulfill (http://localhost:8081/__cypress/runner/cypress_runner.js:11083:18)
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   at http://localhost:8081/__cypress/runner/cypress_runner.js:12697:46
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   From Your Spec Code:
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   at Context.eval (http://localhost:8081/__cypress/tests?p=cypress/integration/workspace.spec.js:2:5686)
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[vinicius73]

There are various improvements in cypress master branch.
Maybe We can manually apply some of then in stable24.