Handle symlinks embedding into binlogs - approach #2 #8306
Merged
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Fixes #6773
Context
Supersedes #8213 and #8282
Symlinked files were not embedded into binlog - previous solution was too much focused on symlinks and hence requried nontrivial code to properly distinguish aymlinks with available contnet.
Alternate approach - proceed with adding file as soon as it has available content
Testing
Preexisting unit test is excercising the scenario. Added a case for empty file - that still should not be added.