Python middleware missing default routes

[lkingland]

The python middleware currently requires the health and readiness endpoints to be defined:

from flask import Flask, request

application = Flask(__name__)


@application.route('/health/readiness')
def probe_health():
    return ""


@application.route('/health/liveness')
def probe_live():
    return ""

The middleware should both attach the routes, and provide a deafault implementation, such that these are non-required.

[github-actions]

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