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

[Nam Pham]

@phanq003 pushed 3 commits.

800e62911f68cffd0a154c0bdf79372267160dc1  Add JavaScript for checking if a form has been changed
1abd91d14b7714790f3ca86fab40b527c1df4e48  Add unsaved-changes-warning attribute to diary entry and messages
6365dcf2a83573b632019b709f7184c2dbd98ce3  add new unsaved changes tests for diary entries and messages

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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/7076/changes/55c8bb2f13b439457b28bee39bd4ef5f5984a14c..6365dcf2a83573b632019b709f7184c2dbd98ce3
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