refactor(styles): Migrate IssueListItem to Styled Components

[josenaranjo]

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I left some StyleSheet styles without migrating because those styles are so specific about a particular behavior that 1. I'm not sure they are going to display the component as expected and 2. It has more meaning as it is. Let me know what you think.

#532

[coveralls]

Coverage increased (+0.1%) to 30.983% when pulling 2cfad22ea197fc0138c395d994ea7014235fd3ce on josenaranjo:refactor-issue-list-item into a43d3bc5ceba76cbb6859e331e744ecd7c18abf8 on gitpoint:master.

[coveralls]

Coverage increased (+3.8%) to 34.636% when pulling 0eddee99b8de13efa49e19645e9428a2166f8971 on josenaranjo:refactor-issue-list-item into a43d3bc5ceba76cbb6859e331e744ecd7c18abf8 on gitpoint:master.

[machour]

Hi @josenaranjo, friendly ping, are you still up for this one? 🙏