isRegionUsingNationalPrefix

[Anrufliste]

Reducing the publication of metadata for a region code of #2583 by just gaining access to its method hasNationalPrefix as an own method for a given RegionCode.

This method is directly used in the existing method getLengthOfGeographicalAreaCode where the beginning code is exactly the code needed for this functionality and thus can be replaced by it.

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[Anrufliste]

@googlebot I fixed it.

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[Anrufliste]

@googlebot I fixed it.

[Anrufliste]

Hi, I think this is still a valid improvement and can be the base for some other improvements like https://issuetracker.google.com/issues/180311606 - can someone of the maintainer give me a feedback how the team see this pr? Thanks and Regards, Emil