feat(storage): add samples and system tests for GCS bucket IP filtering operations

[thiyaguk09]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Code Review

This pull request introduces several new scripts to manage Google Cloud Storage bucket IP filtering configurations, including enabling, disabling, retrieving, listing, and deleting specific IP filter rules, along with corresponding system tests. The review feedback highlights three key areas for improvement: optimizing listBucketIpFilters.js to avoid redundant metadata API calls (preventing an N+1 query issue) and safely accessing metadata properties; fixing a correctness bug in enableBucketIpFilter.js where the filter mode is not updated if an existing configuration is present; and utilizing the spread operator in both enableBucketIpFilter.js and deleteBucketIpFilterRules.js to preserve other properties within the publicNetworkSource configuration.

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