Remove deprecated Ambassador ingress code

[floryut]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Ambassador is no longer maintained and is not working anymore.

Which issue(s) this PR fixes:
None

Special notes for your reviewer:
See discussion #6135 (comment)
And issue in ambassador repo here datawire/ambassador-operator#73

Does this PR introduce a user-facing change?:

[Ambassador] Remove code, ci and ansible tags as it's no longer maintained and not working anymore.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[floryut]

@aztechian let's wait a few days/week before merging this one, but I'm preparing it as I don't have a lot of hope ;)

[aztechian]

Agreed. Sounds good.
Just to confirm - this change won't remove an ambassador install from an existing cluster, correct?

[floryut]

Agreed. Sounds good. Just to confirm - this change won't remove an ambassador install from an existing cluster, correct?

Nop it won't, the ingress_ambassador_enabled key will be ignored if set.

[floryut]

/cc @aztechian @oomichi @EppO
Let's remove.. no answer on datawire end, no issue/pr for more than 6 months, I'd say that this is no longer maintained.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aztechian, floryut

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[oomichi]

/cc @aztechian @oomichi @EppO Let's remove.. no answer on datawire end, no issue/pr for more than 6 months, I'd say that this is no longer maintained.

Sounds reasonable to remove the Ambassador ingress for me.

/lgtm