Support extensions and custom controller flags in deploy-to-kube tool

[igooch]

This PR refactors the deployment tools to support optional extensions and custom controller configuration.

• Breaks up the current deploy-to-kube into separate gather, process, and apply stages.
• Adds a --extensions flag to deploy the extensions resources to the cluster.
• Adds a --controller-args flag to pass arbitrary arguments (e.g., --zap-log-level=debug) directly to the controller container.
• Replaces the manual kubectl patch logic in the Makefile with a native --extensions flag in the deployment script.

This makes the make deploy-kind and ./dev/tools/deploy-to-kube targets much more helpful when developing for the extensions controllers.

[igooch]

@barney-s let me know if you'd prefer this broken down into separate PRs.

[netlify]

✅ Deploy Preview for agent-sandbox canceled.

Name	Link
🔨 Latest commit	df5e558
🔍 Latest deploy log	https://app.netlify.com/projects/agent-sandbox/deploys/69d029e5d18f1b0008e42886

[aditya-shantanu]

/lgtm
/approve

[aditya-shantanu]

/ok-to-test

[justinsb]

We might need to enhance this logic in future, but I think it's a great start. (e.g. --v=2 => --v=8)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aditya-shantanu, igooch, justinsb

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

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [justinsb]

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

[barney-s]

/retest

[barney-s]

@igooch - Could you please investigate the e2e failures ?

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

@igooch: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
presubmit-agent-sandbox-e2e-test	df5e558	link	true	/test presubmit-agent-sandbox-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.