refactor: rename oci_tarball to oci_load #1504

Job	Run time
matrix-prep-bazelversion	8s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	3m 19s
test (ubuntu-latest, 7.1.1, ., false)	2m 23s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	2m 2s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	28s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	26s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	2m 20s
test (ubuntu-latest, 6.4.0, ., true)	2m 48s
test (ubuntu-latest, 6.4.0, ., false)	3m 41s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	35s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	19s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	26s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	2m 35s
test (macos-13, 7.1.1, ., true)	6m 19s
test (macos-13, 7.1.1, ., false)	4m 19s
test (macos-13, 7.1.1, e2e/smoke, true)	1m 35s
test (macos-13, 7.1.1, e2e/smoke, false)	1m 22s
	35m 6s

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