Remove the old release-0.16 pre- and post- install jobs.

[Harwayne]

This should fix #3873, but we'll leave that issue open until a release with eventing.yaml has been created.

Proposed Changes

• Remove the old release-0.16 pre- and post- install jobs.

Release Note

NONE

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Harwayne

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[n3wscott]

you need to push this to the release-0.17 branch, not master

[Harwayne]

you need to push this to the release-0.17 branch, not master

D'oh. Done.

[n3wscott]

/lgtm

[knative-test-reporter-robot]

The following jobs failed:

Test name	Triggers	Retries
pull-knative-eventing-upgrade-tests	2020-08-19 19:33:40.67 +0000 UTC 2020-08-19 19:41:10.861 +0000 UTC 2020-08-19 19:47:10.923 +0000 UTC 2020-08-19 19:54:10.882 +0000 UTC 2020-08-19 20:19:40.658 +0000 UTC	3/3

Job pull-knative-eventing-upgrade-tests expended all 3 retries without success.

[Harwayne]

Discussed in slack. This change is only for release.sh, so it does not affect the code or config. The tests for this PR, and all other PRs in this repo, will fail because it tries to find the latest release's eventing.yaml, which the 0.17.0 release lacks. @lionelvillard agreed that we should just force this in.

[knative-prow-robot]

@Harwayne: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-knative-eventing-upgrade-tests	1aa3077	link	/test pull-knative-eventing-upgrade-tests
pull-knative-eventing-conformance-tests	1aa3077	link	/test pull-knative-eventing-conformance-tests

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