Fix/expected share reduction

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Pull Request Overview

This PR fixes the expected_share_reduction functionality by implementing several code quality improvements and bug fixes. The changes include refactoring a mathematical function for better accuracy, cleaning up code formatting, and updating test configurations.

• Refactored nearest_power_of_10 function to correctly round up to the next multiple of the current power of 10
• Improved code formatting and simplified conditional logic in multiple files
• Updated Rust toolchain version in CI configuration

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/translator/downstream/notify.rs	Reformatted multi-line if statement to single line
src/translator/downstream/downstream.rs	Added first_job parameter and simplified return statements
src/translator/downstream/diff_management.rs	Fixed nearest_power_of_10 algorithm and added comprehensive tests
src/ingress/sv1_ingress.rs	Simplified nested conditional logic and improved import formatting
.github/workflows/checks.yml	Updated Rust toolchain to version 1.87.0

Comments suppressed due to low confidence (1)

src/translator/downstream/downstream.rs:1

• [nitpick] The function call has many parameters which makes it hard to maintain. Consider using a builder pattern or configuration struct to improve readability and reduce the likelihood of parameter ordering errors.

use crate::{

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