fix: Check for wrapped retriable exceptions to handle deadlocks

[juliusknorr]

Follow-up fix for #34302 which was trying to catch an exception that was wrapped by our own exception class so the catch would never have catched.

Exact code part https://github.com/nextcloud/server/pull/34302/files#diff-9cdfa82a2275acf10161656ddc7b70be83cdbf6be8663ecfb8f963e4eb516d8eR139

[szaimen]

@juliushaertl what is missing here?

[juliusknorr]

Split out the new API change and this is now ready for review for just the bugfix

[juliusknorr]

Failure unrelated

[juliusknorr]

/backport to stable26

[juliusknorr]

/backport to stable25

[juliusknorr]

/backport to stable24

[backportbot-nextcloud]

The backport to stable26 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable26
git pull origin/stable26

# Create the new backport branch
git checkout -b fix/foo-stable26

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable26

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[backportbot-nextcloud]

The backport to stable25 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable25
git pull origin/stable25

# Create the new backport branch
git checkout -b fix/foo-stable25

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable25

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[backportbot-nextcloud]

The backport to stable24 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable24
git pull origin/stable24

# Create the new backport branch
git checkout -b fix/foo-stable24

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable24

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[solracsf]

/backport to stable26

[solracsf]

/backport to stable25

[kesselb]

/backport to stable24