cleanup: Deprecate Ingress-Nginx from kubernetes-apps

[jmeza-xyz]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
This deprecates/removes ingress-nginx as part of the kube-apps ingress-controller due to project retirement.

Which issue(s) this PR fixes:

Fixes #12712

Special notes for your reviewer:

Need to confirm testing of removing ingress_nginx_enabled value in the registry task and that ingress_alb_enabled works.

Does this PR introduce a user-facing change?:

cleanup: remove ingress-nginx from kubernetes-apps ingress-controller

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @jmeza-xyz. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tico88612]

/hold
until 2.30.0 release.

[tico88612]

/kind deprecation

[yankay]

/ok-to-test

[jmeza-xyz]

Ran the pre-commit-run -a ; results below.

#  pre-commit run -a
check for added large files..........................................................Passed
check for case conflicts.............................................................Passed
check that executables have shebangs.................................................Passed
check xml............................................................................Passed
check for merge conflicts............................................................Passed
detect private key...................................................................Passed
fix end of files.....................................................................Passed
forbid new submodules............................................(no files to check)Skipped
fix requirements.txt.................................................................Passed
trim trailing whitespace.............................................................Passed
yamllint.............................................................................Passed
shellcheck...........................................................................Passed
ansible-lint.........................................................................Passed
misspell.............................................................................Passed
Build and install kubernetes-sigs.kubespray Ansible collection.......................Passed
generate-docs-sidebar................................................................Passed
ci-matrix............................................................................Passed
Verify correct version for galaxy.yml................................................Passed
jinja-syntax-check...................................................................Passed
Update static files referencing default kubespray values.............................Passed
Check that our checksums are correctly sorted by version.............................Passed
Markdownlint.........................................................................Passed

[tico88612]

@jmeza-xyz don't use merge commit, please use rebase

[jmeza-xyz]

@tico88612 Reverted and used rebase to merge from the docs branch. Will wait for the CI to finish to fix any errors. Thanks

[tico88612]

/retest-failed

[tico88612]

/retest