Refactor Logging and Audit sre_bot module to generic roles module

[patheard]

Summary

Rename the log_archive and audit account's sre_bot module to roles so that it can hold all IAM roles that need to be created in these accounts.

• https://github.com/cds-snc/cds-aws-lz/tree/main/terragrunt/audit/sre_bot
• https://github.com/cds-snc/cds-aws-lz/tree/main/terragrunt/log_archive/sre_bot

This is a similar change to what was done for the org_account roles module refactor.

Related

• refactor: move org resources to a seperate module #161
• feat: SRE vulnerability report Audit/Logging roles #165