Track only GET requests by default

[mneudert]

Description

The user agents filtered out by the (default) user agent allow list are expected to only perform GET requests. Support filtering by HTTP method to avoid tracking e.g. OPTIONS requests we don't expect if the user agent matches the configured pattern.

Checklist

• [✔] I have understood, reviewed, and tested all AI outputs before use
• [✔] All AI instructions respect security, IP, and privacy rules

Review

• Functional review done
• Potential edge cases thought about (behaviour 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
• New documentation added or existing documentation updated

[caddoo]

@mneudert Approved, but had to do some merge conflict resolution, plus an additional small commit to fix documentation. So you can check and then merge.