feat: add config for ubp flat fee lines

[turip]

Until the migration is done.

Summary by CodeRabbit

• New Features

  • Introduced a new configuration option to enable or disable usage-based flat fee lines in billing features.

• Chores

  • Updated internal processes to support the new billing configuration option. No changes to user-facing workflows.

[coderabbitai]

📝 Walkthrough

Walkthrough

This change introduces a new feature flag, UseUsageBasedFlatFeeLines, to the billing configuration. The flag is added to the configuration struct, passed into the billing subscription handler, and subsequently made available to the billing worker subscription logic. Function signatures and relevant wiring are updated to accommodate the new parameter.

Changes

Files/Paths	Change Summary
app/config/billing.go	Added UseUsageBasedFlatFeeLines boolean field to BillingFeatureSwitchesConfiguration struct.
app/common/billing.go	Modified NewBillingSubscriptionHandler to accept config and pass new feature flag to handler.
cmd/billing-worker/wire_gen.go, cmd/jobs/internal/wire_gen.go	Updated calls to NewBillingSubscriptionHandler to include the new billingFeatureSwitchesConfiguration argument.

Possibly related PRs

• feat: use UBP flat fee lines #2898: Adds the UseUsageBasedFlatFeeLines feature flag to configuration and wires it into the billing subscription handler, enabling the toggle for usage-based flat fee line logic.

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (1.64.8)

Error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2
Failed executing command with error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between d4f6833 and 4c69ed5.

📒 Files selected for processing (4)

• app/common/billing.go (2 hunks)
• app/config/billing.go (1 hunks)
• cmd/billing-worker/wire_gen.go (1 hunks)
• cmd/jobs/internal/wire_gen.go (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (4)

• app/config/billing.go
• cmd/billing-worker/wire_gen.go
• cmd/jobs/internal/wire_gen.go
• app/common/billing.go

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