[openstreetmap/openstreetmap-website] Add unsaved changes warning to message and diary forms (PR #7076)

[Nam Pham]

@phanq003 pushed 2 commits.

9493bdcb86fa00f9c5b9673e77f1598820860f4e  add attribute indicating when there are unsaved changes
55c8bb2f13b439457b28bee39bd4ef5f5984a14c  add new unsaved changes tests for messages

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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/7076/changes/05fc44b8a5c867d2e088a94acf579296750916ed..55c8bb2f13b439457b28bee39bd4ef5f5984a14c
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