[~TASK][!!!] FLOW3: Make symlink mirror mode the default
[~TASK][!!!] FLOW3: Make symlink mirror mode the default

The setting FLOW3:resource:publishing:fileSystem:mirrorMode
is now set to "link" by default which means that instead of
copying each resource file to the public directory, symlinks
are used.

It is not 100% clear yet, how systems not supporting symlinks
behave - if you experience any problems, please open an issue
with a good error description so we can take some precautions

Relates to: #8056

Change-Id: I2ca87862ded4d719bfc2776da2837e33645f4ab1
Original-Commit-Hash: d199532e045ee94b664a700658916c0cf620ac4d

fcool/flow-development-collection,aertmann/flow-development-collection,chewbakartik/flow-development-collection,kitsunet/flow-development-collection,dfeyer/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,bwaidelich/flow-development-collection,gerhard-boden/flow-development-collection,dfeyer/flow-development-collection,daniellienert/flow-development-collection,fcool/flow-development-collection,mkeitsch/flow-development-collection,dfeyer/flow-development-collection,kitsunet/flow-development-collection,daniellienert/flow-development-collection,neos/flow-development-collection,gerhard-boden/flow-development-collection,neos/flow-development-collection,dlubitz/flow-development-collection,kdambekalns/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,robertlemke/flow-development-collection,mkeitsch/flow-development-collection,mkeitsch/flow-development-collection,albe/flow-development-collection,gerhard-boden/flow-development-collection,albe/flow-development-collection,dfeyer/flow-development-collection,robertlemke/flow-development-collection,kdambekalns/flow-development-collection,dlubitz/flow-development-collection,dlubitz/flow-development-collection,robertlemke/flow-development-collection,robertlemke/flow-development-collection,bwaidelich/flow-development-collection,chewbakartik/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,aertmann/flow-development-collection,bwaidelich/flow-development-collection,neos/flow-development-collection,aertmann/flow-development-collection,kitsunet/flow-development-collection,daniellienert/flow-development-collection,kdambekalns/flow-development-collection