Update cookie validation regex in Get Cookies test

[yuriverweij]

Fix flaky Get Cookies test

The previous regex used | to handle any cookie ordering, but the ^ and $ anchors were not wrapping both alternatives, leaving each side only partially anchored and allowing substring matches. For example, the first alternative only required the string to start with test=seleniumlibrary; another=value, meaning a third cookie appended at the end would still pass.

All 3 cookies were always being returned, but the test was silently passing in the past because the browser was consistently returning cookies in an order that accidentally satisfied the faulty regex.

Replaced the regex with a stricter pattern that matches exactly 3 known cookies in any order, with no room for unexpected extras.

[Copilot]

Pull request overview

This PR fixes a flaky acceptance test around Get Cookies by tightening the cookie-string validation so it no longer passes on partial/substring matches caused by incorrectly anchored alternation.

Changes:

• Adds explicit assertions that all three expected cookies are present in the returned cookie string.
• Replaces the prior alternation-based regex with a fully anchored regex that matches exactly three name=value cookie pairs (in any order) separated by ; .

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