docs: add Buildkite example to CI Vendors documentation #6254

Job	Run time
Find path changes	20s
Rust lints	6m 45s
Turborepo Integration (macos-13)	35m 9s
Turborepo Integration (ubuntu-latest)	12m 46s
Turborepo rust check	5m 0s
Turborepo Integration (windows-latest)	30m 26s
@turbo/types codegen check	43s
Turborepo Rust testing on windows	17m 18s
Turborepo Rust testing on ubuntu	10m 15s
Turborepo Rust testing on macos	20m 31s
`kitchen-sink` example	0s
`basic` example	6m 15s
`with-svelte` example	13m 53s
`non-monorepo` example	4m 57s
`with-tailwind` example	4m 54s
Turborepo Test Summary	2s
Cleanup / cleanup	6s
	2h 49m 20s

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