How can a package of assets be installed to AEM package manager without triggering all the workflows?
If AEM Assets will be in use during the package installation then you will need to exclude the affected folder from the workflow launchers.
Disable those workflow models if no users will be on the system during package installation. If users will be on the system, then modify the launcher config Path* field to exclude the specific folder where the assets are being installed to. For example:
The above example excludes the path /content/dam/folder/for/new/assets, however you can modify this regular expression as required to exclude other folders.