fix(studio): use configured gp3 max-throughput ceiling (#50355)

`calculateMaxThroughput` still hard-capped at 1000 MB/s while
`DISK_LIMITS.gp3.maxThroughput` moved to 2000, so large gp3 disks were
rejected with a misleading "Need at least N IOPS to support X MB/s"
error even when IOPS and compute were already sufficient. Now reads the
configured ceiling, mirroring the IOPS fix in #50269 that missed this
sibling.

Fixes FE-4385

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- GP3 storage configurations can now support throughput scaling up to
2,000 MB/s when sufficient compute capacity is available.
- Larger GP3 configurations, including up to 4,096 GB with 80,000 IOPS
and 2,000 MB/s throughput, are now recognized as valid when capacity
requirements are met.

- **Bug Fixes**
- Corrected the maximum GP3 throughput calculation to honor the
supported service limit.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/studio/components/interfaces/DiskManagement/DiskManagement.test.ts

@@ -8,6 +8,7 @@ import {
   calculateIOPSPrice,
   calculateMaxIopsAllowedForDiskSizeWithGp3,
   calculateMaxIopsForComputeSize,
+  calculateMaxThroughput,
   calculateThroughputPrice,
   mapAddOnVariantIdToComputeSize,
   mapComputeSizeNameToAddonVariantId,
@@ -84,6 +85,18 @@ describe('calculateMaxIopsAllowedForDiskSizeWithGp3', () => {
   })
 })
 
+describe('calculateMaxThroughput', () => {
+  // Regression: the ceiling was hardcoded to 1000 MB/s while DISK_LIMITS.gp3.maxThroughput moved
+  // to 2000, so large gp3 disks were rejected with a misleading "need more IOPS" error.
+  test('scales with provisioned IOPS below the gp3 max throughput ceiling', () => {
+    expect(calculateMaxThroughput(4000)).toBe(1024)
+  })
+
+  test('caps at the gp3 max throughput ceiling (2000 MB/s)', () => {
+    expect(calculateMaxThroughput(80000)).toBe(2000)
+  })
+})
+
 describe('DiskManagement.utils.ts:calculateDiskSizePrice', () => {
   test('GP3 with 8GB to GP3 with 10GB for pro plan', () => {
     const result = calculateDiskSizePrice({
@@ -233,6 +246,24 @@ describe('CreateDiskStorageSchema', () => {
     )
   })
 
+  test('allows gp3 throughput above 1000 MB/s when IOPS and compute support it', () => {
+    const schema = CreateDiskStorageSchema({
+      defaultTotalSize: 4096,
+      cloudProvider: 'AWS',
+      isSpendCapEnabled: false,
+    })
+
+    const result = schema.safeParse({
+      ...validGp3Config,
+      totalSize: 4096,
+      provisionedIOPS: 80000,
+      throughput: 2000,
+      computeSize: 'ci_16xlarge' as const,
+    })
+
+    expect(result.error?.issues ?? []).toEqual([])
+  })
+
   test('allows a legacy disk below 8 GB when its size is unchanged', () => {
     const schema = CreateDiskStorageSchema({
       defaultTotalSize: 2,

apps/studio/components/interfaces/DiskManagement/DiskManagement.utils.ts

@@ -298,8 +298,9 @@ export const calculateDiskSizeRequiredForIopsWithIo2 = (iops: number) => {
   return Math.max(4, Math.ceil(iops / 1000))
 }
 
+const MAX_GP3_THROUGHPUT = DISK_LIMITS[DiskType.GP3]['maxThroughput']
 export const calculateMaxThroughput = (iops: number) => {
-  return Math.min(0.256 * iops, 1000)
+  return Math.min(0.256 * iops, MAX_GP3_THROUGHPUT)
 }
 
 export const calculateIopsRequiredForThroughput = (throughput: number) => {