Add build command and success/error messages to edit ws server

[tjholm]

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Name	Status	Preview	Comments	Updated (UTC)
nitric-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 16, 2025 1:59am

[davemooreuws]

Currently breaks with no targets in nitric.yaml:

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x18 pc=0x1f3808d]

goroutine 21 [running]:
github.com/nitrictech/nitric/engines/terraform.(*TerraformEngine).Apply(0xc0009f4840, 0x0)
C:/projects/nitric/nitric/engines/terraform/terraform.go:459 +0x2d
github.com/nitrictech/nitric/cli/internal/devserver.(*NitricProjectBuild).OnMessage(0xc0004e2e80, {0xc000540740, 0x38, 0x40})
C:/projects/nitric/nitric/cli/internal/devserver/build.go:90 +0x37e

[tjholm]

Currently breaks with no targets in nitric.yaml:

panic: runtime error: invalid memory address or nil pointer dereference [signal 0xc0000005 code=0x0 addr=0x18 pc=0x1f3808d]

goroutine 21 [running]: github.com/nitrictech/nitric/engines/terraform.(*TerraformEngine).Apply(0xc0009f4840, 0x0) C:/projects/nitric/nitric/engines/terraform/terraform.go:459 +0x2d github.com/nitrictech/nitric/cli/internal/devserver.(*NitricProjectBuild).OnMessage(0xc0004e2e80, {0xc000540740, 0x38, 0x40}) C:/projects/nitric/nitric/cli/internal/devserver/build.go:90 +0x37e

fixed by adding missing return statement