chore: move upstream tests from travisCI

[exdx]

Description of the change:
Move upstream tests to Github Actions and remove TravisCI configuration entirely.

Upstream actions were added as well as an update to the release docs. The existing release CI was not changed but the unit job was consolidated as part of the upstream tests. The only functional change was codecov reported errors did not result in a CI failure.

Prerequisite for getting the opm e2e tests to run as expected again

Motivation for the change:
Travis changed their policy around supporting open source repositories

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[codecov]

Codecov Report

Merging #536 (d82884e) into master (2e9bb75) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #536   +/-   ##
=======================================
  Coverage   49.45%   49.45%           
=======================================
  Files          90       90           
  Lines        6317     6317           
=======================================
  Hits         3124     3124           
  Misses       2497     2497           
  Partials      696      696           

---

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[exdx]

The upstream e2e tests now match the e2e results locally - all but one test is skipped and the remaining test fails. This will be addressed in follow-up PRs but I believe this PR fulfills its original goal of moving upstream CI to Github Actions

[exdx]

/bugzilla override

[ankitathomas]

/lgtm

[exdx]

/test e2e-aws

[benluddy]

/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ankitathomas, benluddy, exdx

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[hasbro17]

/lgtm

[exdx]

This PR will be merged manually since there is no accompanying BZ and it only introduces net-new CI. The e2e CI has now been moved to GitHub Actions as intended -- the fact that kind CI is red is intentional and does not block any registry PRs (these Actions are not required for prow to merge). The failing CI should bring attention to the fact that the registry e2e tests are not working as intended, 10/11 tests are being skipped as they were on TravisCI.

Subsequent work will be done to address the skipped e2e tests and the issue that causes the Launch bundle test to fail on kind -- since this test builds images on the host and then uses them within the kind cluster there is no way to share these images without an overhaul of the test.

[exdx]

/override ci/prow/e2e-aws

[openshift-ci-robot]

@exdx: Overrode contexts on behalf of exdx: ci/prow/e2e-aws

In response to this:

/override ci/prow/e2e-aws

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