Prefix all ids with account and tenant ids

[alexweininger]

Fixes #972

Add the /accounts/<accountId>/tenants/<tenantId> prefix to all items. This includes adding it to each item level in Resources: subscription items, grouping items, and resource items. Then I prefix all items provided by contributed branch data providers as well.

Copilot reviewed 5 out of 8 changed files in this pull request and generated no comments.

Files not reviewed (3)

• src/tree/BranchDataItemCache.ts: Evaluated as low risk
• src/tree/BranchDataItemWrapper.ts: Evaluated as low risk
• src/tree/ResourceTreeDataProviderBase.ts: Evaluated as low risk

Comments suppressed due to low confidence (1)

src/tree/azure/AzureResourceItem.ts:31

• Ensure that the prefix is added only once to avoid duplicate prefixes. Consider checking if the prefix is already present before adding it.

readonly id = `${createAzureIdPrefix(this.resource.subscription)}${this.resource.id}`;