feat: [UIE-9078] - IAM RBAC: add the missing permission check for Linode CreateDiskDrawer

[aaleksee-akamai]

Description 📝

This PR fixes the missing IAM permission check.

Changes 🔄

List any change(s) relevant to the reviewer.

• Add permission check for Create disk drawer
• Update tests

Scope 🚢

Upon production release, changes in this PR will be visible to:

• All customers
• Some customers (e.g. in Beta or Limited Availability)
• No customers / Not applicable

Target release date 🗓️

August 26

How to test 🧪

Prerequisites

(How to setup test environment)

MSW or iam (restricted) + regular account to compare
Permissions to check:

Custom User Entity Permissions preset:

[
    "create_linode_disk", 
]

Verification steps

(How to verify changes)

• Confirm the buttons/inputs are disabled according the grant model with IAM is off, and according to the RBAC model when IAM is on.

Author Checklists

As an Author, to speed up the review process, I considered 🤔

👀 Doing a self review
❔ Our contribution guidelines
🤏 Splitting feature into small PRs
➕ Adding a changeset
🧪 Providing/improving test coverage
🔐 Removing all sensitive information from the code and PR description
🚩 Using a feature flag to protect the release
👣 Providing comprehensive reproduction steps
📑 Providing or updating our documentation
🕛 Scheduling a pair reviewing session
📱 Providing mobile support
♿ Providing accessibility support

• I have read and considered all applicable items listed above.

As an Author, before moving this PR from Draft to Open, I confirmed ✅

• All tests and CI checks are passing
• TypeScript compilation succeeded without errors
• Code passes all linting rules

[kwojtowiakamai]

✅ The Create Disk Drawer is correctly enabled/disabled based on the permissions/grants for the IAM and non-IAM users.

[coliu-akamai]

✅ checked create disk restricted and non restricted IAM users
✅ checked create disk using grant model

I ran the failing linode-storage.spec.ts tests and the resize/add a disk tests passed locally (delete disk has been having issues, so that's most likely unrelated)

thanks @aaleksee-akamai!

[jaalah-akamai]

✅ Confirmed issue in DevCloud environment

Local Changes Verified for Restricted User "Add A Disk":
✅ Properly enabled with grant system (as expected via permissions)
✅ Properly disabled with IAM system (as expected without permissions)

[linode-gh-bot]

Cloud Manager UI test results

🎉 719 passing tests on test run #5 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
0 Failing	719 Passing	4 Skipped	127m 46s