chore(gas_price_service): minor refactors to make the code more readable

[rymnc]

Linked Issues/PRs

• none

Description

AI generated pr desc:
This pull request includes various changes to improve code readability, simplify logic, and ensure consistency across the gas_price_service module. The most important changes include refactoring trait bounds, updating method calls, and improving error handling.

Refactoring trait bounds:

• crates/services/gas_price_service/src/common/fuel_core_storage_adapter.rs: Combined multiple trait bounds into single lines for better readability. [1] [2] [3]

Updating method calls:

• crates/services/gas_price_service/src/v0/service.rs: Removed unnecessary async from the set_metadata method and updated its calls accordingly. [1] [2] [3]

Improving error handling:

• crates/services/gas_price_service/src/v0/uninitialized_task.rs: Replaced ok_or with ok_or_else for better performance.
• crates/services/gas_price_service/src/v1/da_source_service/block_committer_costs.rs: Updated error handling to use ok_or_else and improved iterator logic. [1] [2]

Consistency improvements:

• crates/services/gas_price_service/src/common/updater_metadata.rs: Replaced enum variant names with Self for consistency.
• crates/services/gas_price_service/src/v1/uninitialized_task.rs: Unified the handling of optional values using map_or and map_or_else for clarity. [1] [2] [3]

These changes collectively enhance the maintainability and performance of the gas_price_service module.

Checklist

• Breaking changes are clearly marked as such in the PR description and changelog
• New behavior is reflected in tests
• The specification matches the implemented behavior (link update PR if changes are needed)

Before requesting review

• I have reviewed the code myself
• I have created follow-up issues caused by this PR and linked them here

[acerone85]

looks good, thanks :)