Improve check for correctly set cookie by casting to string #17928

Description:

Fixes #17926

Cookies are string values so if we set a cookie with an int value we need to check the string value of that int against the set cookie to make sure it was correctly set (otherwise eg '12345' !== 12345 and we log an unnecessary console error)

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

build js

This issue is in "needs review" but there has been no activity for 7 days. ping @matomo-org/core-reviewers