fix(ci): add DEPLOY_TAG in fork log group (#3510)

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including relevant motivation and context.

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
the PR is ready to merge.
- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [ ] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [ ] Every change is related to the PR description.
- [ ] I have
[linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
this pull request to relevant issues (if any exist).

---------

Co-authored-by: PhilWindle <60546371+PhilWindle@users.noreply.github.com>

iac/mainnet-fork/terraform/main.tf

@@ -226,7 +226,7 @@ resource "aws_ecs_service" "aztec_mainnet_fork" {
 }
 
 resource "aws_cloudwatch_log_group" "aztec_mainnet_fork_logs" {
-  name              = "/fargate/services/aztec_mainnet_fork"
+  name              = "/fargate/services/${var.DEPLOY_TAG}-mainnet_fork"
   retention_in_days = "14"
 }