E2E

Make `flower-server` start server with HTTPS by default #4608

Job	Run time
Build, test and upload wheel	1m 11s
Framework / bare	1m 32s
Strategy / FedMedian	1m 14s
Framework / bare-https	1m 11s
Strategy / FedTrimmedAvg	1m 5s
Framework / jax	4m 38s
Strategy / QFedAvg	1m 5s
Framework / pytorch	2m 59s
Strategy / FaultTolerantFedAvg	1m 7s
Framework / tensorflow	3m 1s
Strategy / FedAvgM	1m 8s
Framework / tabnet	2m 30s
Strategy / FedAdam	1m 4s
Framework / opacus	2m 56s
Strategy / FedAdagrad	1m 9s
Framework / pytorch-lightning	2m 32s
Strategy / FedYogi	1m 11s
Framework / mxnet	1m 35s
Framework / scikit-learn	2m 36s
Framework / fastai	3m 45s
Framework / pandas	1m 28s
	40m 57s

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