Disable TravisCI in favor of CodeBuild

[trivikr]

Is your feature request related to a problem? Please describe.
Currently we run CI on both Travis as well as CodeBuild

Describe the solution you'd like

• In v3, we disabled TravisCI in favor of CodeBuild in chore: remove TravisCI aws-sdk-js-v3#386
• The build logs are publicly accessible using https://github.com/jlhood/github-codebuild-logs
• We can remove TravisCI in v2 after some time (say a month), if it's manageable just with CodeBuild in v3

[trivikr]

We've moved comprehensive testing to CodeBuild as of now in #3154

TravisCI can be disabled once we can run multiple versions of Node.js runtime
Awaiting sample at awsdocs/aws-codebuild-user-guide#57

[trivikr]

Closing as we plan to use:

• TravisCI for running coverage test for supported Node.js versions
• CodeBuild for running comprehensive test for latest LTS Node.js version

[lock]

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