refactor: deduplicate selected-item bulk action dispatch

[somethingwithproof]

Summary

• add a shared helper to dispatch selected-item bulk actions and export payload storage
• switch alerts, reports, and removal handlers to use the shared helper
• keep per-page action maps local to preserve behavior
• add regression test asserting helper existence and usage in all three pages
• update changelog with issue refactor: deduplicate bulk action item handling across alerts/reports/removal pages #276

Fixes #276

Validation

• php -l functions.php
• php -l syslog_alerts.php
• php -l syslog_reports.php
• php -l syslog_removal.php
• php -l tests/regression/issue276_bulk_action_dispatch_helper_test.php
• php tests/regression/issue276_bulk_action_dispatch_helper_test.php

[Copilot]

Pull request overview

This PR refactors the Syslog plugin’s rule pages (alerts/reports/removal) to remove duplicated “selected items” bulk-action dispatch logic by introducing a shared helper in functions.php, while keeping per-page action maps local to preserve behavior.

Changes:

• Add syslog_apply_selected_items_action() helper to centralize selected-item action dispatch and export session storage.
• Update form_actions() handlers in alerts/reports/removal pages to use the shared helper.
• Add a small regression test to assert the helper exists and is referenced by all three pages; update changelog for issue #276.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
functions.php	Introduces shared selected-item bulk-action dispatch helper (including export session handling).
syslog_alerts.php	Refactors bulk action dispatch in form_actions() to call the shared helper.
syslog_reports.php	Refactors bulk action dispatch in form_actions() to call the shared helper.
syslog_removal.php	Refactors bulk action dispatch in form_actions() to call the shared helper.
tests/regression/issue276_bulk_action_dispatch_helper_test.php	Adds regression coverage to detect removal/non-usage of the shared helper (string-based).
CHANGELOG.md	Adds issue #276 entry under develop.

[TheWitness]

More merge conflicts.

[TheWitness]

So, let's do the following in this pull @somethingwithproof:

1. Refix functions.php to remove $uniqueID in the query
2. Reorder the workflow to put Lint, CS-Fixer, and PHPStan before right after the PHP is installed and the plugin is ready
3. Switch from echo to print. At some point, we will have to validate that.
4. Make sure the pre-commit hook is successful by running composer run-script plugins/syslog