Set test mission 1 marker file permissions

Allow the test mission 1 marker file to be read by anyone.
Also, add demo flags as a static lib dependency, so they become
available to codegen. Finally, delete storage marker file when migration
is disabled.

Bug: 328444881
Test: m
Change-Id: I81c643ce0121b0718692fd23f5b06a2b641f2b1e