Add dotnet coverage task (#2062)

* checkpoint

* some more progress

* more progress

* More progress

* Now it's time to test it

* It works locally 🎉

* Attempting clean build

* fmt

* temporarily stub out macos

* missed a few

* please be the last one

* .

* .

* .

* noop change to unstuck actions

* .

* .

* Fix setup script

* Some fixes

* It works except for a race condition -- use a directory watcher to fix it

* It works end to end!

* Execute the commands using tokio's structs and timeout mechanism

* It works.... for real this time

* Undo timer changes

* Cleanup

* 🧹

* Fix import

* .

* PR comments

* Fix clippy

* Clippy whyyy

* Only check dotnet path once

* fmt

* Fix a couple more comments

src/pytypes/onefuzztypes/enums.py

@@ -165,6 +165,8 @@ class TaskType(Enum):
     generic_crash_report = "generic_crash_report"
     generic_regression = "generic_regression"
 
+    dotnet_coverage = "dotnet_coverage"
+
 
 class VmState(Enum):
     init = "init"