Add a default resource naming convention to mlz.bicep

[glennmusa]

Description

So that deployed resources adopt generally accepted naming practices while providing a single place in source to modify the naming convention, this change introduces a default naming convention to mlz.bicep:

missionlz/src/bicep/mlz.bicep

Line 20 in 270f7e5

var namingConvention = '${toLower(resourcePrefix)}-${resourceToken}-${nameToken}-${toLower(resourceSuffix)}'

These changes:

• adopts a naming convention for the resources named at mlz.bicep
• uses the recommended abbreviations where possible
• provide an obvious mechanism to override naming conventions
• documents how to override naming conventions
• ensures all resource names are in lower case
• adds an additional optional parameter resourceSuffix that defaults to "mlz"
• includes resourceSuffix in automatic tags.
• updates the uniqueString() seed for storage accounts makes use of resourcePrefix and resourceSuffix
• the storage accounts can be deployed multiple times without destroying and recreating, preserving idempotency
• updates the AzurePolicyforLinux extension name for the Linux jumpbox to match the documented API

Issue reference

The issue this PR will closes: #556 #559

Checklist

Please make sure you've completed the relevant tasks for this PR out of the following list:

• All acceptance criteria in the backlog item are met
• The documentation is updated to cover any new or changed features
• Manual tests have passed
• Relevant issues are linked to this PR