chore(runtime): Cleanup offset constants in `String` module #9800

Job	Run time
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	4s
Build and test on windows-latest / Dependencies / Create dependencies cache	11s
Build and test on macos-latest / Dependencies / Create dependencies cache	6s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	12m 14s
Build and test on ubuntu-latest / (native) Build and test / (native) Build and test	5m 11s
Build and test on macos-latest / (js) Build and test / (js) Build and test	28m 5s
Build and test on macos-latest / (native) Build and test / (native) Build and test	5m 35s
Build and test on windows-latest / (js) Build and test / (js) Build and test	13m 5s
Build and test on windows-latest / (native) Build and test / (native) Build and test	16m 6s
Test pkg binaries / Test pkg binary on ubuntu-latest	51s
Test pkg binaries / Test pkg binary on macos-latest	1m 22s
Test pkg binaries / Test pkg binary on windows-latest	21s
	1h 23m 11s

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