[chore] remove mentions of the `memory_ballast` extension #22305

Job	Run time
govulncheck	28s
setup-environment	12s
checks	2m 3s
lint	3m 42s
unittest-matrix (ubuntu-latest, ~1.23)	2m 34s
unittest-matrix (ubuntu-latest, ~1.22)	2m 21s
cross-build-collector (darwin, amd64)	40s
test-coverage	6m 6s
cross-build-collector (darwin, arm64)	39s
cross-build-collector (linux, 386)	45s
cross-build-collector (linux, amd64)	50s
cross-build-collector (linux, arm64)	39s
cross-build-collector (linux, ppc64le)	45s
cross-build-collector (linux, arm, 7)	38s
cross-build-collector (linux, s390x)	36s
cross-build-collector (windows, 386)	37s
cross-build-collector (windows, amd64)	49s
unittest	1s
	24m 25s

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