Boost: add cache rebuild functionality #78850

Job	Run time
Determine tests matrix	1m 8s
E2E: Build jetpack-boost	3m 16s
E2E: Build jetpack-core	3m 39s
Jetpack connection e2e tests	4m 55s
Jetpack pre-connection e2e tests	2m 32s
Jetpack post-connection e2e tests	7m 15s
Jetpack Boost - Base e2e tests	5m 1s
Jetpack Boost - Modules e2e tests	4m 20s
Jetpack Boost - Critical CSS e2e tests	4m 31s
Jetpack Boost - Page Cache e2e tests	2m 50s
Jetpack Boost - Concatenate JS/CSS e2e tests	2m 27s
Jetpack Boost - Image CDN e2e tests	3m 37s
Jetpack Boost - Image Guide e2e tests	2m 39s
Test report	3s
Slack notification	58s
	49m 11s

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