docs(project): update v10 website banner to reflect v10 end of support

[tay1orjones]

Closes https://github.com/carbon-design-system/carbon/issues/12497 Related https://github.com/carbon-design-system/carbon-website/pull/4301, https://github.com/carbon-design-system/carbon/pull/17615, https://github.com/carbon-design-system/carbon/pull/17616

Changelog

Changed

• Update v10 branch/website banner with end-of-support content

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