fix(ci): do not install cypress in jest workflow.

[max-nextcloud]

It is not required and attempting to install can cause failures
if the cypress server cannot be reached such as here:
https://github.com/nextcloud/text/actions/runs/12330192763/job/34415369232?pr=6780

[mejo-]

/backport to stable30

[mejo-]

/backport to stable29

[backportbot]

The backport to stable30 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable30
git pull origin stable30

# Create the new backport branch
git checkout -b backport/6781/stable30

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 5aee32e0

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6781/stable30

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/6781/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 5aee32e0

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6781/stable29

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[max-nextcloud]

There's no more jest in later versions - this is against stable29.