chore: support redirect on auth failure for echo routes

[hamidzr]

Description

• add a middleware that supports optional redirects on auth failures for given routes
• use it to set up this behavior for proxied servers

somewhat similar to what we do with det proxies for tasks

determined/master/internal/api_auth.go

Lines 119 to 129 in 63b381a

	// to authenticate incoming HTTP requests coming through proxies.
	func processProxyAuthentication(c echo.Context) (done bool, err error) {
	user, _, err := user.GetService().UserAndSessionFromRequest(c.Request())
	if errors.Is(err, db.ErrNotFound) {
	return true, redirectToLogin(c)
	} else if err != nil {
	return true, err
	}
	if !user.Active {
	return true, redirectToLogin(c)
	}

Test Plan

no changes are expected when the internal proxied_servers config is not used.
when a proxied server (aka a sidecar) is used the unauthenticated requests to those paths are expected to be redirected to the signin ui

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

[netlify]

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[salonig23]

LGTM!