fix(package_info_plus)!: allow no page extension in versionJsonUrl on web

[NicolasDionB]

Description

This PR aims at fixing a scenario where we get version.json from the app page with no file extension on the web. Such an url would previously break the version.json url when trying to get it.

Related Issues

• Fixes [Bug]: Wrong version.json path when last part of url isn't a folder #2282

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I titled the PR using Conventional Commits.
• I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• All existing and new tests are passing.
• The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

• Yes, this is a breaking change (please indicate that with a ! in the title as explained in Conventional Commits).
• No, this is not a breaking change.

There is a small breaking change as an url not ending with a slash would previously have been recognized as a folder, resulting in a different url. For exemple, given an app url "https://example.com/a/b/c?hello_world=true#/my-page", the version.json path would be:

• Before change: "https://example.com/a/b/c/version.json?cachebuster=1" (notice the "c/" in url)
• After change: "https://example.com/a/b/version.json?cachebuster=1"

[vbuberen]

Thank you for your contribution!