ICU-23210 Try fixing behavior of MATCH_*_FIELD_LENGTH

[sffc]

Proof-of-concept for ICU-23210

Checklist

• [x] Required: Issue filed: ICU-23210
• [x] Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• [x] Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• [ ] Issue accepted (done by Technical Committee after discussion)
• [ ] Tests included, if applicable
• [ ] API docs and/or User Guide docs changed or added, if applicable

[sffc]

Also please note that I haven't updated all of the ICU4J tests yet. I wanted to ask about a few because @richgillam you recently (1 yr ago) added them in ICU-22669