[Tile-serving] [openstreetmap/mod_tile] Fix `DEFAULT_ATTRIBUTION` value and add tests (PR #360)

[Hummeltech]

The value for `DEFAULT_ATTRIBUTION` in `includes/mod_tile.h` needed to be escaped, it was causing a JSON parsing failure.
* Added basic test for `/.../.../tile-layer.json` to ensure parsing is successful
* Added basic tests for `/metrics` & `/mod_tile` URLs
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/360

-- Commit Summary --

  * Fix DEFAULT_ATTRIBUTION breaking JSON
  * Add tests for `/metrics`, `/mod_tile` & `/././tile-layer.json`

-- File Changes --

    M .github/actions/dependencies/install/action.yml (10)
    M includes/mod_tile.h (2)
    M tests/CMakeLists.txt (93)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/360.patch
https://github.com/openstreetmap/mod_tile/pull/360.diff

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