feat: increase storage pricing by 40% (step 2 of 3)

[bjoernek]

Summary

• Second step of the 2.5x storage pricing increase approved by motion proposal 140538
• Increases gib_storage_per_second_fee from 177,800 to 248,920 cycles (5.6 → 7.84 SDR/GiB/year)
• Updates all test assertions to reflect the 1.4× fee increase

Context

The full rollout plan (4 → 10 SDR/GiB/year) proceeds in three steps:

1. Step 1 (+40%): 4.0 → 5.6 SDR — merged in feat: increase storage pricing #9127
2. Step 2 (+40%): 5.6 → 7.84 SDR — this PR
3. Step 3 (+27.5%): 7.84 → 10.0 SDR — upcoming

[Copilot]

Pull request overview

Implements step 2 of the staged storage pricing rollout by raising the application-subnet storage fee (gib_storage_per_second_fee) by 40%, and updates affected tests to reflect the higher storage/reservation/freezing-threshold related cycle charges.

Changes:

• Increase gib_storage_per_second_fee from 177_800 to 248_920 cycles/sec in subnet configuration.
• Update execution-environment and scheduler tests that depend on storage/freezing-threshold/reservation costs to use the new expected cycle amounts.
• Bump initial cycle balances in a few integration-style tests (e.g., PocketIC gateway, hypervisor) to prevent unintended out-of-cycles behavior under the new pricing.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rs/config/src/subnet_config.rs	Updates the production application-subnet storage fee constant.
rs/execution_environment/tests/subnet_size_test.rs	Updates test config + yearly-cost assertions for the new storage fee.
rs/execution_environment/tests/storage_reservation.rs	Adjusts expected reserved-cycles totals driven by storage reservation pricing.
rs/execution_environment/tests/hypervisor.rs	Increases initial canister cycles in memory-growth/freezing-threshold tests affected by storage pricing.
rs/execution_environment/tests/execution_test.rs	Adjusts cycle amounts in reserved-balance/freezing behavior test to match higher storage costs.
rs/execution_environment/src/scheduler/tests/charging.rs	Updates cycle balances used in snapshot deletion/uninstall tests impacted by memory charging.
rs/execution_environment/src/execution_environment/tests/canister_snapshots.rs	Updates cycle balances used by snapshot tests to reflect higher reservation/storage costs.
rs/execution_environment/src/execution/response/tests.rs	Updates additional-freezing-threshold constants used in DTS response tests.
rs/execution_environment/src/execution/call_or_task/tests.rs	Updates additional-freezing-threshold constant used in DTS update test.
rs/pocket_ic_server/tests/gateway.rs	Increases cycles provisioned to the II canister to accommodate the higher storage pricing.

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