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Updates HGTD disk rotations to post TDR values

Alexander Leopold requested to merge atlas-hgtd/athena:hgtd_disk_rot into 21.9

After input from the mechanics side, the disk rotations should be updated to the current best guess. To create relative rotation that fulfils the constraints coming from alignment of cooling manifolds, the first disk is not rotated, while the second disk is rotated by -15 degrees in phi.

See for example slide 19 here.

Tagging @cohm, @lshan, @dshope

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