imprv: Typescriptize page tag relation model

[kaori-tokashiki]

Task

• 93933 PageTagRelationのTS化

Note

CIでfailしている CodeQL のアラートは、本PRの変更とは関係のないものだと判断しましたのでスルーで良いかと思います。

[reg-suit[bot]]

reg-suit detected visual differences.

Check this report, and review them.

:red_circle::red_circle::red_circle::red_circle::red_circle::red_circle::red_circle:

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What do the circles mean?

The number of circles represent the number of changed images.
:red_circle: : Changed items, :white_circle: : New items, :black_circle: : Deleted items, and :large_blue_circle: Passed items

How can I change the check status?

If reviewers approve this PR, the reg context status will be green automatically.