CCM-9648 - standardise tfscaffold conventions

[alexnuttall]

Description

• removes all instances of var.module replacing with a local, to increase clarity around the intention that this should not be overridden.
• remove var.module from resource names in amp_branch, kms and lambda, to standardise.

Other changes:

• added local.module (amp) to amplify_branch (module was kms)
• removed unused csi_global / csi_account / csi locals
• add missing Name tag in lambda
• change s3 Name tag from var.name to local.csi_global
• added var.name to backup-source, currently hardcoded to backup. Added Module = backup to local.default_tags

Questions:

• Does the change to backup_source make sense?
• What should local.default_tags.Name be? In this PR have it equal to local.csi_global in s3 and local.csi everywhere else. kms uses a mix of csi and csi_account in resource names/ids

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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