Add system tests (for events calendar view)

[fbacall]

Summary of changes

• Adds system tests using Capybara/Selenium.
• Tests the events calendar view tab will load the calendar (via AJAX) when clicked.

Motivation and context

Catches the issue that was resolved by #1309

Can be used to test other JS features.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

Pull request overview

Adds Rails system test infrastructure (Capybara/Selenium) and a system test to validate that the Events “Calendar” tab loads the calendar via AJAX and renders an event, intended to guard against regressions like the jQuery/CSP issue fixed in #1309.

Changes:

• Add Capybara + Selenium WebDriver and a base ApplicationSystemTestCase for headless Chrome system tests.
• Add a system test covering the Events calendar tab AJAX load/render path.
• Update CI workflow to run system tests.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/test_helper.rb	Adjust VCR config to ignore localhost requests.
test/application_system_test_case.rb	Introduces shared system test base class using headless Chrome (Selenium).
test/system/events_calendar_system_test.rb	New system test asserting calendar tab loads and renders an event.
Gemfile	Adds capybara and selenium-webdriver to the test group.
Gemfile.lock	Locks new test dependencies (Capybara, Selenium, transitive deps).
.github/workflows/test.yml	Renames workflow and adds a step to run rails test:system.

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