feat: add envoy-admin-forward make target

[DCchoudhury15]

Fixes #325

Changes proposed in this pull request:

• Added a new envoy-admin-forward make target under the Debug section to expose the Envoy Admin UI on localhost:15000.
• Updated the local-env-setup, local-env-setup-olm, and dev targets to print a helpful message notifying developers that they can run this new command.

This addresses the maintainer's suggestion to provide a make target for the kubectl port-forward command.

Summary by CodeRabbit

• New Features

  • Added a command to quickly port-forward the Envoy Admin UI to localhost:15000 for local development access.

• Chores

  • Enhanced local environment setup with improved guidance for accessing the Envoy Admin interface.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 6e7b04b8-e9cd-4404-a2cf-ad1ba68556c6

📥 Commits

Reviewing files that changed from the base of the PR and between b7cc91e and 87bbc83.

📒 Files selected for processing (1)

• Makefile

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📝 Walkthrough

Walkthrough

A new envoy-admin-forward make target is added to enable port-forwarding of the Envoy Admin interface to localhost:15000 against the mcp-gateway-istio deployment in the gateway-system namespace, with user-facing URL guidance printed before execution.

Changes

Cohort / File(s)	Summary
Make Target Addition Makefile	Added envoy-admin-forward phony target to port-forward Envoy Admin UI to localhost:15000 with informational output.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a new make target for envoy-admin-forward.
Linked Issues check	✅ Passed	The PR addresses issue #325 by providing a make target for port-forwarding to the Envoy Admin UI, meeting the core objective.
Out of Scope Changes check	✅ Passed	All changes (new make target and updates to existing targets) are directly related to exposing the Envoy Admin UI.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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