Replace index with id in actions routes (#36842)

This PR migrates the web Actions run/job routes from index-based
`runIndex` or `jobIndex` to database IDs.

**⚠️ BREAKING ⚠️**: Existing saved links/bookmarks that use the old
index-based URLs will no longer resolve after this change.

Improvements of this change:
- Previously, `jobIndex` depended on list order, making it hard to
locate a specific job. Using `jobID` provides stable addressing.
- Web routes now align with API, which already use IDs.
- Behavior is closer to GitHub, which exposes run/job IDs in URLs.
- Provides a cleaner base for future features without relying on list
order.
- #36388 this PR improves the support for reusable workflows. If a job
uses a reusable workflow, it may contain multiple child jobs, which
makes relying on job index to locate a job much more complicated

---------

Signed-off-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

models/migrations/migrations.go

@@ -400,6 +400,7 @@ func prepareMigrationTasks() []*migration {
 		newMigration(323, "Add support for actions concurrency", v1_26.AddActionsConcurrency),
 		newMigration(324, "Fix closed milestone completeness for milestones with no issues", v1_26.FixClosedMilestoneCompleteness),
 		newMigration(325, "Fix missed repo_id when migrate attachments", v1_26.FixMissedRepoIDWhenMigrateAttachments),
+		newMigration(326, "Migrate commit status target URL to use run ID and job ID", v1_26.FixCommitStatusTargetURLToUseRunAndJobID),
 	}
 	return preparedMigrations
 }