refactor: delete export-aws-secrets-manager, move logic to setup

[suzuki-shunsuke]

Summary

• Remove the export-aws-secrets-manager action and its router entry
• Move AWS Secrets Manager business logic (run.ts, run.test.ts) to src/actions/setup/aws_secrets_manager.ts
• Add awsSecretsManagerConfig to TargetConfig with env_name-based merging (jobConfig overrides group)
• Integrate AWS Secrets Manager secret fetching directly into the setup action, unifying it with GitHub secrets into a single secrets output

Test plan

• npm t — all 796 tests pass
• npm run lint — clean
• npm run fmt — clean

🤖 Generated with Claude Code

⚠️ Breaking Changes

The action export-aws-secrets-manager is removed.
Instead setup action outputs secrets.

[suzuki-shunsuke-tfaction]

Plan Result (tests/opentofu/bar-2)

CI link

Plan: 1 to add, 0 to change, 0 to destroy.

• Create
  • null_resource.foo

Change Result (Click me)

  # null_resource.foo will be created
  + resource "null_resource" "foo" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

[suzuki-shunsuke-tfaction]

Plan Result (tests/opentofu/bar)

CI link

Plan: 1 to add, 0 to change, 0 to destroy.

• Create
  • null_resource.foo

Change Result (Click me)

  # null_resource.foo will be created
  + resource "null_resource" "foo" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

[suzuki-shunsuke-tfaction]

Plan Result (tests/terragrunt/zoo-2)

CI link

Plan: 1 to add, 0 to change, 0 to destroy.

• Create
  • null_resource.foo

Change Result (Click me)

  # null_resource.foo will be created
  + resource "null_resource" "foo" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

[suzuki-shunsuke-tfaction]

Plan Result (tests/foo)

CI link

Plan: 1 to add, 0 to change, 0 to destroy.

• Create
  • null_resource.foo

Change Result (Click me)

  # null_resource.foo will be created
  + resource "null_resource" "foo" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

[suzuki-shunsuke-tfaction]

Plan Result (tests/terragrunt/zoo)

CI link

Plan: 1 to add, 0 to change, 0 to destroy.

• Create
  • null_resource.foo

Change Result (Click me)

  # null_resource.foo will be created
  + resource "null_resource" "foo" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

[suzuki-shunsuke-tfaction]

Plan Result (tests/foo-2)

CI link

Plan: 1 to add, 0 to change, 0 to destroy.

• Create
  • null_resource.foo

Change Result (Click me)

  # null_resource.foo will be created
  + resource "null_resource" "foo" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.