std: sysstr cleanup, add docs
#25180
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- Removed redundant `len` and `reserved` sets already
performed by prior `rawNewStringNoInit` calls.
- Reuse `appendChar`
- Removed never used `newOwnedString`
- Added internal `toOwnedCopy`
- Documents differences in impls of internal procs used for
`system.string.setLen`:
+ `strs_v2.setLengthStrV2`:
- does not set the terminating zero byte when new length is 0
- does not handle negative new length
+ `sysstr.setLengthStr`:
- sets the terminating zero byte when new length is 0
- bounds negative new length to 0
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lenandreservedsets already performed by priorrawNewStringNoInitcalls.appendCharnewOwnedStringtoOwnedCopysystem.string.setLen:strs_v2.setLengthStrV2:sysstr.setLengthStr: