To avoid confusion this PR renames HIGH_CONTRAST to FORCED_COLOURS, as the forced-colors isn't just for high contrast mode, it's also used for user customised colours, like the settings used in firefox
Code changes
Replaces instances of HIGH_CONTRAST with FORCED_COLOURS name
Testing
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Resolves JIRA N/A
Overall changes
To avoid confusion this PR renames HIGH_CONTRAST to FORCED_COLOURS, as the
forced-colorsisn't just for high contrast mode, it's also used for user customised colours, like the settings used in firefoxCode changes
Testing
Helpful Links
Add Links to useful resources related to this PR if applicable.
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