Adjust preview channel condition

[michalkleiner]

Description:

We've changed the approach from -preview to -pYYYYmmddHHiiss so this is just adjusting the script to be aware of that and not treat tags with the -p... suffix as stable releases.

Additionally this fixes the build server check as $F wasn't defined at that point so the file never existed and the check always succeeded.

Adds a new check for preview version to core/Version.php from where we can use it in other parts of Matomo as well as in the build script to determine if a version is a preview version without duplicating the same logic in a convoluted way in a bash script.

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