refactor(job): pull out shared fail_cond and log_opt init

[dlyongemallo]

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[Copilot]

Pull request overview

This PR refactors job-related option initialization by centralizing fail_cond resolution and default log_opt construction into a shared utility module, and adds functional tests to validate the new helpers.

Changes:

• Introduces diffview.job_utils with resolve_fail_cond() and default_log_opt() helpers.
• Updates Job and MultiJob initializers to use the shared helpers instead of duplicating logic.
• Adds functional tests covering both helper functions.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
lua/diffview/job_utils.lua	New shared helper module for fail condition resolution and log option defaults.
lua/diffview/job.lua	Uses job_utils to initialize log_opt and check_status.
lua/diffview/multi_job.lua	Uses job_utils to initialize log_opt and check_status.
lua/diffview/tests/functional/job_utils_spec.lua	Adds functional test coverage for the new helper functions.

Comments suppressed due to low confidence (1)

lua/diffview/multi_job.lua:10

• local fmt = string.format is now unused in this module after the refactor. Please remove it to avoid dead code.

local job_utils = require("diffview.job_utils")
local utils = lazy.require("diffview.utils") ---@module "diffview.utils"

local await = async.await
local fmt = string.format

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