fix: //orchestrion:ignore is not respected for Echo handlers

[Trighap52]

Why is this change being made?

//orchestrion:ignore was not effective for Echo routes because tracing was injected at router level (echo.New -> e.Use(echotrace.Middleware())), so ignored handlers were still traced.

This caused high-volume endpoints (for example readiness/liveness probes) to emit traces even when explicitly marked with //orchestrion:ignore.

What is the change?

• Added a built-in aspect that rewrites echo.New() to runtime/echoignore.New().
• Added runtime/echoignore helper package:
  • creates Echo router
  • installs echotrace.Middleware with WithIgnoreRequest(...)
  • skips tracing when matched route handler is registered as ignored
• Added injector pre-pass to register ignored Echo handlers by injecting:
  • var _ = echoignore.RegisterIgnoredEchoHandlerFunc(...)
• Added runtime tests for ignore handler registration and request-ignore matching.
• Added a samples regression case for ignored Echo handlers and updated snapshots.

How was this tested?

• go test ./runtime/echoignore
• go test ./internal/injector/...
• cd samples && go test -run TestSamples .

Fixes: #709