Require a user-supplied value for resourcePrefix and do not use deployment().name for seeding names

[glennmusa]

Benefit/Result/Outcome

So that users make conscious decisions about how things are named.

Description

As part of creating uniqueness, update mlz.bicep to require the mandatory input of the resourcePrefix parameter.

Today, the deployment().name property is used today to seed resource names and uniqueness for resources that require global uniqueness. This property is relative to the ARM deployment and not relative to anything Mission Landing Zone or any parameter value the user has provided.

The direction the team has decided in #549 is to start deriving resource names and uniqueness from a user-supplied value instead.

This is where a uniqueId is seeded:

missionlz/src/bicep/mlz.bicep

Line 529 in 1f1b126

param uniqueId string = uniqueString(deployment().name)

Then it is used to determine the resourcePrefix:

missionlz/src/bicep/mlz.bicep

Lines 304 to 307 in 1f1b126

	@minLength(3)
	@maxLength(24)
	@description('A name (3-24 alphanumeric characters in length without whitespace) used to prefix resources and generate uniqueness for resources with globally unique naming requirements like Storage Accounts and Log Analytics Workspaces')
	param resourcePrefix string = 'mlz-${uniqueId}'

And then resourcePrefix is used for resource names:

missionlz/src/bicep/mlz.bicep

Line 319 in 1f1b126

param hubResourceGroupName string = '${resourcePrefix}-hub'

And also used for generating uniqueness:

missionlz/src/bicep/mlz.bicep

Line 345 in 1f1b126

param hubLogStorageAccountName string = toLower(take('hublogs${uniqueId}', 24))

Instead, take resourcePrefix as a required parameter. Then, use the user-supplied resourcePrefix plus some other uniqueish seed like UtcNow or a GUID to generate uniqueness where it's required.

Acceptance Criteria

• resourcePrefix is a parameter without a default
• deployment().name is not used as a seed for resource names
• deployment().name is not used as a seed for uniqueness
• resourcePrefix + some uniqueish seed generates uniqueness