[pkg/ottl/ottlfuncs] Added utf8 support to truncate_all function #36712
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Description
Truncate_all will slice the string up to the given length. If truncating at exactly the length results in a broken UTF-8 encoding, it'll truncate before where the last UTF-8 character started.
Link to tracking issue
Fixes #36017
Testing
Two UTF-8 characters were added to the end of the string and the limit was adjusted to match them and the truncation process was tested.
Documentation
Updated pkg/ottl/ottfuncs/README.md with description.