[w3c/selection-api] Replace Travis CI with w3c/spec-prod GH action (#137)

Travis CI is not very responsive, and w3c/spec-prod is the preferred solution as of now.

Please remove Travis CI from the required status check list before merging this.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/137

-- Commit Summary --

  * Replace Travis CI with w3c/spec-prod GH action

-- File Changes --

    A .github/workflows/auto-validate.yml (12)
    D .travis.yml (26)

-- Patch Links --

https://github.com/w3c/selection-api/pull/137.patch
https://github.com/w3c/selection-api/pull/137.diff

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