Add --default-target-type flag

[johngmyers]

Issue

Closes #2690

Description

Adds a --default-target-type flag which sets the default target type of both Services and Ingresses.

The desired target type of an ALB or NLB is almost always determined by the the cluster's CNI. If a cluster's CNI uses ENIs (like AWS VPC CNI does) then the desired target type is ip. If a cluster's CNI uses masquerading, then the desired target type is instance.

When a cluster's CNI uses ENIs, it is a burden to require each workload's Ingress and Service resources to include an LBC-specific annotation in order to function.

This allows clusters with ENI-based CNIs to set the default target type to ip, allowing Ingress and Service resources to work correctly without having to set a target-type annotation on each one.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[codecov-commenter]

Codecov Report

Base: 54.07% // Head: 54.01% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (851a7d0) compared to base (a92e689).
Patch coverage: 28.57% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2840      +/-   ##
==========================================
- Coverage   54.07%   54.01%   -0.06%     
==========================================
  Files         144      144              
  Lines        8301     8312      +11     
==========================================
+ Hits         4489     4490       +1     
- Misses       3484     3494      +10     
  Partials      328      328              

Impacted Files	Coverage Δ
pkg/config/controller_config.go	15.38% <0.00%> (-2.48%)	⬇️
pkg/ingress/model_builder.go	63.90% <50.00%> (-0.32%)	⬇️
pkg/service/model_builder.go	88.29% <100.00%> (+0.12%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[johngmyers]

One question would be how to document the default value of annotations whose default value depend on flags.

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue or PR as fresh with /remove-lifecycle stale
• Mark this issue or PR as rotten with /lifecycle rotten
• Close this issue or PR with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[kishorj]

nit: default value in the configurations.md
Changes look good to me.

[kishorj]

/lgtm
/approve

Thanks a lot for the contribution

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, kishorj

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [kishorj]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[kishorj]

/lgtm