Panics not formatted as JSON when LOG_JSON is true

[alec-brooks]

When an FTL controller panics, it seems to print the stack trace to stdout even when LOG_JSON is true. This makes it difficult to read the stack traces in a log aggregator.

See below for a block logs that I recently pulled from an FTL controller, as you can see there is JSON logged normally followed by a panic. A seperate issue will be filed for the actual panic.

{"level":"trace","attributes":{"scope":"reconcileRunners"},"message":"Running scheduled task","time":"2024-05-28T05:48:43.725419134Z"}
{"level":"trace","message":"/xyz.block.ftl.v1.VerbService/GetModuleContext (unary)","time":"2024-05-28T05:48:43.730843304Z"}
2024/05/28 05:48:43 http2: panic serving 127.0.0.6:43935: no configuration manager in context
goroutine 712469 [running]:
golang.org/x/net/http2.(*serverConn).runHandler.func1()
	/root/go/pkg/mod/golang.org/x/net@v0.25.0/http2/server.go:2363 +0x145
panic({0xf74a80?, 0x1501420?})
	/root/.cache/hermit/pkg/go-1.22.3/src/runtime/panic.go:770 +0x132
go.opentelemetry.io/otel/sdk/trace.(*recordingSpan).End.deferwrap1()
	/root/go/pkg/mod/go.opentelemetry.io/otel/sdk@v1.27.0/trace/span.go:381 +0x25
go.opentelemetry.io/otel/sdk/trace.(*recordingSpan).End(0xc00001ea80, {0x0, 0x0, 0xc00094f500?})
	/root/go/pkg/mod/go.opentelemetry.io/otel/sdk@v1.27.0/trace/span.go:419 +0xa82
panic({0xf74a80?, 0x1501420?})
	/root/.cache/hermit/pkg/go-1.22.3/src/runtime/panic.go:770 +0x132
github.com/TBD54566975/ftl/common/configuration.ConfigFromContext(...)
	/src/common/configuration/context.go:34
github.com/TBD54566975/ftl/backend/controller.(*Service).GetModuleContext(0x1?, {0x15165d8, 0xc00190c720}, 0x1?)
	/src/backend/controller/controller.go:662 +0xb1a
connectrpc.com/connect.NewUnaryHandler[...].func1({0x151f990, 0xc0014baa80})
	/root/go/pkg/mod/connectrpc.com/connect@v1.16.1/handler.go:52 +0x14f
github.com/TBD54566975/ftl/internal/rpc.(*versionInterceptor).WrapUnary.versionInterceptor.WrapUnary.func1({0x15165d8, 0xc00190c720}, {0x151f990, 0xc0014baa80})
	/src/internal/rpc/context.go:232 +0x43
connectrpc.com/otelconnect.(*Interceptor).WrapUnary.func1({0x15165d8, 0xc00190c6f0}, {0x151f990, 0xc0014baa80})
	/root/go/pkg/mod/connectrpc.com/otelconnect@v0.7.0/interceptor.go:152 +0x1454
github.com/TBD54566975/ftl/internal/rpc.(*metadataInterceptor).WrapUnary.func1({0x1518250, 0xc00200c6a0}, {0x151f990, 0xc0014baa80})
	/src/internal/rpc/context.go:159 +0x24b
connectrpc.com/connect.NewUnaryHandler[...].func2({0x7f8f2b28fe78, 0xc00200c6e0})
	/root/go/pkg/mod/connectrpc.com/connect@v1.16.1/handler.go:70 +0xa2
connectrpc.com/connect.(*Handler).ServeHTTP(0xc0000200e0, {0x1515220, 0xc000474000}, 0xc00090c360)
	/root/go/pkg/mod/connectrpc.com/connect@v1.16.1/handler.go:238 +0x94f
github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/ftlv1connect.NewVerbServiceHandler.func1({0x1515220, 0xc000474000}, 0xc00090c360)
	/src/backend/protos/xyz/block/ftl/v1/ftlv1connect/ftl.connect.go:247 +0xb1
net/http.HandlerFunc.ServeHTTP(0xc000380270?, {0x1515220?, 0xc000474000?}, 0x76d94f?)
	/root/.cache/hermit/pkg/go-1.22.3/src/net/http/server.go:2166 +0x29
net/http.(*ServeMux).ServeHTTP(0xc000ac59e0?, {0x1515220, 0xc000474000}, 0xc00090c360)
	/root/.cache/hermit/pkg/go-1.22.3/src/net/http/server.go:2683 +0x1ad
github.com/TBD54566975/ftl/internal/rpc.NewServer.ContextValuesMiddleware.func3({0x1515220, 0xc000474000}, 0xc000ac59e0)
	/src/internal/rpc/rpc.go:91 +0xce
net/http.HandlerFunc.ServeHTTP(0xc001eef560?, {0x1515220?, 0xc000474000?}, 0xc001d3bda0?)
	/root/.cache/hermit/pkg/go-1.22.3/src/net/http/server.go:2166 +0x29
golang.org/x/net/http2.(*serverConn).runHandler(0x44723d?, 0x0?, 0xc001a84240?, 0x0?)
	/root/go/pkg/mod/golang.org/x/net@v0.25.0/http2/server.go:2370 +0xbb
created by golang.org/x/net/http2.(*serverConn).scheduleHandler in goroutine 314
	/root/go/pkg/mod/golang.org/x/net@v0.25.0/http2/server.go:2305 +0x21d
{"level":"debug","message":"Unary RPC failed: canceled: failed to spawn plugin: plugin process died: context canceled: /xyz.block.ftl.v1.RunnerService/Deploy","time":"2024-05-28T05:48:43.773299485Z"}```