test: cover the Tag admin screen

[marevol]

Summary

Adds a tagtype module covering the Tag admin screen (/admin/tagtype/) that codelibs/fess#3551 adds for per-user tags in Fess 15.9. The module is modelled on the label tests.

• add: creates a tag with name, owner, paths, permissions and sort order, and checks the list and the details.
• list/search: searches by name and by owner.
• validation: rejects a blank name, a blank owner, a whitespace-only name and a name over the default 50-character limit.
• update: changes the paths and the owner, and checks the details afterwards.
• delete: deletes the tag and waits until the list no longer shows it.

The module runs right after label in the default order and is skipped on Fess versions older than 15.9.

Testing

• The suite's unit tests pass (119), all files compile, and the label/message keys exist in all bundles.
• I ran it against a Fess built from the #3551 code with OpenSearch 3, in an isolated compose project:
  • label and tagtype pass in English, and tagtype passes in Japanese.
  • As a negative control, a deliberately wrong expectation made the run fail.

Until a Fess snapshot image that includes #3551 is published, tagtype will fail against the current snapshot image.