clean up dea packaging and job packages

removes insight_agent package and blob, and other stale DEA dependencies

these dependencies existed before we used rootfs; the dea itself
shouldn't need them

[#56835342]

Signed-off-by: Aram Price <aprice@pivotallabs.com>
remove imagemagick cruft

[#56835342]

Signed-off-by: Aram Price <aprice@pivotallabs.com>
remove dashboard and tools submodule

We never deploy dashboard, and it was the only thing using tools/.

[#56835342]

Signed-off-by: Aram Price <aprice@pivotallabs.com>