For the application module, we use the application path obtained from early injection or /proc/self/exe on Linux, rather than /proc/self/maps comments. The maps comments can be unreliable in the face of anonymous or deleted-file mremaps used for hugepage backing and other features.
Adds a test case to the existing "burst_maps" test.
Having the right module full_path helps many cases, including the forthcoming restartable sequences ("rseq") support for #2350 (closed).
Issue: #2566 (closed), #2350 (closed)