Add a new Unit Test to request_id_test.go to check that the middleware doesn't change a preexisting X-Request-ID header on the request.
Basically is a test that exercises the false path of this code
https://github.com/labstack/echo/blob/6caec3032be056516e30440d1f5bdb5514ad8ad5/middleware/request_id.go#L51-L54

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In our codebase, we push RequestContext and immediately run some code with try-with-resources.
For example:

try (SafeCloseable ignored = ctx.push()) {
    logger.trace(decorate(msg));
}

If RequestContext provides run(Runnable) or call(Callable) we can reduce boilerplate code and simplify it.

ctx.run(() -> logger.trace(decorate(msg));

This is inspired by g