Fix crash on creating debug archive in read-only location

[claucambra]

Also notifies user if the location is not writeable, and sets the documents folder as the default location to stop the user from running into this issue easily

[claucambra]

/backport to stable-3.12

[claucambra]

/backport to stable-3.13.0

[backportbot]

The backport to stable-3.13.0 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-3.13.0
git pull origin stable-3.13.0

# Create the new backport branch
git checkout -b backport/6598/stable-3.13.0

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 0f0e8d16 766ebbf6 30867ca3

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6598/stable-3.13.0

Error: Failed to clone repository: Failed to checkout branches: error: pathspec 'stable-3.13.0' did not match any file(s) known to git

---

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

[backportbot]

The backport to stable-3.12 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-3.12
git pull origin stable-3.12

# Create the new backport branch
git checkout -b backport/6598/stable-3.12

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 0f0e8d16 766ebbf6 30867ca3

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6598/stable-3.12

Error: Failed to clone repository: Failed to checkout branches: error: Your local changes to the following files would be overwritten by checkout:
src/gui/macOS/ClientCommunicationProtocol.h
Please commit your changes or stash them before you switch branches.
Aborting

---

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

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-6598-30867ca3324e86a9d41130e260177c926636e3a3-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

Please make sure to quit your existing Nextcloud app and backup your data.

[sonarcloud]

Please retry analysis of this Pull-Request directly on SonarCloud