fix(fonts): replaces ubuntu with roboto

[slhay28]

Description

replaces ubuntu with roboto

Changes

• replaces ubuntu with roboto

Testing

make sure all fonts render as expected

[rdkcmf-jenkins]

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[anthony9187]

two things:
What are the metrics files used for? do we need them?
we're only using Roboto-Bold and Roboto-Regular in AppCoreExtensions, can we remove the other versions from the assets?

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• Protex Server Path: /home/blackduck/github/solid-ui/14/rdkcentral/solid-ui

• Commit: 43a9d7a

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Blackduck scan failure details

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• Protex Server Path: /home/blackduck/github/solid-ui/14/rdkcentral/solid-ui

• Commit: 23fd37b

Report detail: gist