ICU-22159 Merge inDaylightTime to Calendar

[FrankYFTang]

All the subclass implementation of inDaylightTime are the same so just move to a base class implementation.

Checklist

• [X] Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-22159
• [X] Required: The PR title must be prefixed with a JIRA Issue number.
• [X] Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
• [X] Required: Each commit message must be prefixed with a JIRA Issue number.
• [ ] Issue accepted (done by Technical Committee after discussion)
• [ ] Tests included, if applicable
• [ ] API docs and/or User Guide docs changed or added, if applicable

[FrankYFTang]

no urgent need for 72. we should wait for 73.

[pedberg-icu]

no urgent need for 72. we should wait for 73.

This must wait for 73 since we are after the 72 code freeze, and this cannot be merged to main until the maint/maint-72 branch is created. I will wait to review until then.

[markusicu]

@FrankYFTang looks ready to merge for ICU 73.