E2E

Retire the example of quickstart-xgboost-horizontal #6029

Job	Run time
Build, test and upload wheel	3m 14s
Strategy / FedMedian	1m 8s
Framework / bare	1m 32s
Strategy / FedTrimmedAvg	1m 13s
Framework / bare-https	1m 18s
Strategy / QFedAvg	1m 18s
Framework / jax	2m 11s
Strategy / FaultTolerantFedAvg	1m 15s
Framework / pytorch	2m 35s
Strategy / FedAvgM	1m 14s
Framework / tensorflow	2m 59s
Strategy / FedAdam	1m 12s
Framework / tabnet	2m 48s
Strategy / FedAdagrad	1m 12s
Framework / opacus	2m 39s
Strategy / FedYogi	1m 9s
Framework / pytorch-lightning	2m 37s
Framework / mxnet	1m 44s
Framework / scikit-learn	2m 14s
Framework / fastai	3m 58s
Framework / pandas	1m 34s
	41m 4s

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