E2E

Retire the example of quickstart-xgboost-horizontal #6030

Job	Run time
Build, test and upload wheel	1m 24s
Strategy / FedMedian	1m 15s
Strategy / FedTrimmedAvg	1m 23s
Framework / bare	2m 31s
Strategy / QFedAvg	2m 22s
Strategy / FaultTolerantFedAvg	1m 11s
Framework / bare-https	1m 24s
Strategy / FedAvgM	1m 8s
Framework / jax	2m 7s
Strategy / FedAdam	1m 6s
Framework / pytorch	3m 9s
Strategy / FedAdagrad	1m 16s
Framework / tensorflow	3m 0s
Framework / tabnet	2m 54s
Strategy / FedYogi	1m 10s
Framework / opacus	2m 42s
Framework / pytorch-lightning	2m 35s
Framework / mxnet	1m 41s
Framework / scikit-learn	2m 18s
Framework / fastai	4m 15s
Framework / pandas	1m 34s
	42m 25s

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