refactor: rename oci_tarball to oci_load #1503

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	2s
test (ubuntu-latest, 7.1.1, ., true)	1m 28s
test (ubuntu-latest, 7.1.1, ., false)	1m 31s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	1m 29s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	12s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	10s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	1m 30s
test (ubuntu-latest, 6.4.0, ., true)	1m 30s
test (ubuntu-latest, 6.4.0, ., false)	1m 29s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	52s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	14s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	14s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	1m 31s
test (macos-13, 7.1.1, ., true)	1m 44s
test (macos-13, 7.1.1, ., false)	1m 41s
test (macos-13, 7.1.1, e2e/smoke, true)	41s
test (macos-13, 7.1.1, e2e/smoke, false)	41s
	17m 0s

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