fix: [UIE-9487] VPC UI not displaying DBaaS resources

[smans-akamai]

Description 📝

This pull request fixes an issue in the VPC UI where DBaaS resources aren't being counted or displayed.

This issue consists of the following:

• The Resource counts shown in the VPC, VPC details, and Subnets tables aren't including the number of databases in the count
• In the VPC Details Subnets table, the resource tables shown under each expanded Subnet don't include a databases table in addition to the pre-existing Linode and Nodebalancer tables.

Changes 🔄

List any change(s) relevant to the reviewer.

• Updating any Resource counts to include the number of databases in that count.
• In the VPC Details Subnets table, under an expanded Subnet, display a databases table in addition to the pre-existing Linode and Nodebalancer tables.
• Introducing and integrating the new vpcDbaasResources feature flag

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 🗓️

TBD

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How to test 🧪

Prerequisites

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Reproduction steps

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Verification steps

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Author Checklists

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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