Adding mc_13p6TeV gridpacks symlinks [skip modfiles]

Marisilvia Donadellirequested to merge
silvinha_atlmcprod_11285 into master

Description of bug

Production launched without mc_13p6TeV gridpacks.

Changes introduced

Symlinks to mc_13p6TeV gridpacks added to the existing DSIDs, together with JOs and mc_13TeV gridpacks.

Tests

See JIRA-11285

Issues resolved

Closes #

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