[bluegreen] can't see new app logs on failed start because it is deleted
## Describe the bug
On a failed bluegreen deployment, when the new app failed to start, cloudfoundry indicates to check the logs for more information.
```
TIP: use 'cf logs wrm-gateway-service-tmp --recent' for more information
```
But the template deletes the app as a bluegreen rollback thus it is impossible to access the logs and understand why the new app version failed to start.
## Expected behavior
~~The app new version (with the `tmp`) should not be deleted (may be changing the suffix to `tmp-failed`?).~~
The app new version (with the `tmp`) logs should be saved as artifact.
## Actual behavior
The app new version is deleted and the logs are not available
## Logs and/or screenshots
```
....
Start unsuccessful
TIP: use 'cf logs my-app-tmp --recent' for more information
FAILED
[ERROR] --- blue-green: failed deploying new app instance (see logs): cleanup
Deleting app my-app-tmp in org my-org / space my-space as [MASKED]...
```
## Context & Configuration
The issue was reproduced using CloudFoundry template v1.1.0
issue