fix: add helper plugin to keep paths within sandbox #488

Job	Run time
matrix-prep-bazelversion	2s
matrix-prep-os	4s
test (ubuntu-latest, 6.3.2, true, .)	1m 14s
test (ubuntu-latest, 6.3.2, true, e2e/smoke)	27s
test (ubuntu-latest, 6.3.2, true, e2e/npm-links)	15s
test (ubuntu-latest, 6.3.2, true, e2e/sourcemaps)	20s
test (ubuntu-latest, 6.3.2, true, e2e/tsconfig)	18s
test (ubuntu-latest, 6.3.2, true, e2e/bundle)	14s
test (ubuntu-latest, 6.3.2, false, .)	50s
test (ubuntu-latest, 6.3.2, false, e2e/smoke)	17s
test (ubuntu-latest, 6.3.2, false, e2e/npm-links)	15s
test (ubuntu-latest, 6.3.2, false, e2e/sourcemaps)	17s
test (ubuntu-latest, 6.3.2, false, e2e/tsconfig)	13s
test (ubuntu-latest, 6.3.2, false, e2e/bundle)	14s
test (ubuntu-latest, 5.3.2, false, e2e/smoke)	18s
test (ubuntu-latest, 5.3.2, false, e2e/npm-links)	18s
test (ubuntu-latest, 5.3.2, false, e2e/sourcemaps)	17s
test (ubuntu-latest, 5.3.2, false, e2e/tsconfig)	16s
test (ubuntu-latest, 5.3.2, false, e2e/bundle)	17s
	6m 26s

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