chore(runtime): Cleanup offset constants in `String` module #9789

Job	Run time
Build and test on windows-latest / Dependencies / Create dependencies cache	10s
Build and test on macos-latest / Dependencies / Create dependencies cache	5s
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	3s
Build and test on ubuntu-latest / (native) Build and test / (native) Build and test	5m 23s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	12m 49s
Build and test on macos-latest / (native) Build and test / (native) Build and test	6m 30s
Build and test on macos-latest / (js) Build and test / (js) Build and test	25m 32s
Build and test on windows-latest / (native) Build and test / (native) Build and test	17m 54s
Build and test on windows-latest / (js) Build and test / (js) Build and test	16m 15s
Test pkg binaries / Test pkg binary on ubuntu-latest	54s
Test pkg binaries / Test pkg binary on macos-latest	1m 4s
Test pkg binaries / Test pkg binary on windows-latest	21s
	1h 27m 0s

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