Enable Integration Testing

[davinci26]

When we run integration tests in the github CI we get the following exception due to Envoy not being available in the container:

panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xf8fdc15]

goroutine 729 [running]:
testing.tRunner.func1.2({0xfa78200, 0xfebf920})
	/Users/ben.kochie/.asdf/installs/golang/1.22.0/go/src/testing/testing.go:1631 +0x3f7
testing.tRunner.func1()
	/Users/ben.kochie/.asdf/installs/golang/1.22.0/go/src/testing/testing.go:1634 +0x6b6
panic({0xfa78200?, 0xfebf920?})
	/Users/ben.kochie/.asdf/installs/golang/1.22.0/go/src/runtime/panic.go:770 +0x132
github.com/reddit/monoceros/internal/supervisor.TestSupervisorRun.func7(0xc00013d520)
	/Users/ben.kochie/github/reddit/monoceros/internal/supervisor/supervisor_test.go:577 +0x12d5
testing.tRunner(0xc00013d520, 0xfb0a890)
	/Users/ben.kochie/.asdf/installs/golang/1.22.0/go/src/testing/testing.go:1689 +0x21f
created by testing.(*T).Run in goroutine 13
	/Users/ben.kochie/.asdf/installs/golang/1.22.0/go/src/testing/testing.go:1742 +0x826
FAIL	github.com/reddit/monoceros/internal/supervisor	31.593s
ok  	github.com/reddit/monoceros/internal/worker	11.653s
FAIL