Fix flaky test from #4995

[obulat]

Fixes

Fixes #4995 by @sarayourfriend

Description

Fixes the test by adding a check for the copy button: it is only enabled after the app has finished hydrating.

A different test (checking the preferences switch sets the cookie value) was found as flaky, so I added a check to that test as well.

Testing Instructions

The CI should pass (several times?)

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
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• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

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[github-actions]

Latest k6 run output¹

$     ✓ status was 200

     checks.........................: 100.00% ✓ 8000      ✗ 0   
     data_received..................: 1.8 GB  8.5 MB/s
     data_sent......................: 1.0 MB  4.9 kB/s
     http_req_blocked...............: avg=7.58µs   min=1.29µs  med=2.47µs   max=4.84ms  p(90)=3.55µs   p(95)=3.88µs  
     http_req_connecting............: avg=4.5µs    min=0s      med=0s       max=4.79ms  p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=555.39ms min=27.47ms med=496.07ms max=2.37s   p(90)=1.04s    p(95)=1.15s   
       { expected_response:true }...: avg=555.39ms min=27.47ms med=496.07ms max=2.37s   p(90)=1.04s    p(95)=1.15s   
   ✓ http_req_failed................: 0.00%   ✓ 0         ✗ 8000
     http_req_receiving.............: avg=156.14µs min=36.92µs med=112.26µs max=19.41ms p(90)=184.27µs p(95)=234.03µs
     http_req_sending...............: avg=22.84µs  min=7.23µs  med=19.65µs  max=3.94ms  p(90)=26.63µs  p(95)=33.11µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s       max=0s      p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=555.21ms min=27.33ms med=495.86ms max=2.37s   p(90)=1.04s    p(95)=1.15s   
     http_reqs......................: 8000    37.373823/s
     iteration_duration.............: avg=3.71s    min=1.17s   med=3.16s    max=11.41s  p(90)=8.1s     p(95)=8.61s   
     iterations.....................: 1200    5.606073/s
     vus............................: 2       min=2       max=30
     vus_max........................: 30      min=30      max=30

Footnotes

1. This comment will automatically update with new output each time k6 runs for this PR ↩