[openstreetmap/openstreetmap-website] SpamScorer: normalise whitespace in comparable form (PR #6661)

[Grant]

### Description
Collapse Unicode whitespace runs to a single space and trim in SpamScorer::RichText#to_comparable_form to improve SpammyPhrase matching across newlines/tabs.

### How has this been tested?
Suitable tests have been added. Will be run as part of CI.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6661

-- Commit Summary --

  * SpamScorer: normalise whitespace in comparable form

-- File Changes --

    M lib/spam_scorer/rich_text.rb (2)
    M test/lib/spam_scorer_test.rb (15)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6661.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6661.diff

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