[vcpkg-tool] x-add-version should verify the port version

[SunBlack]

Describe the issue
In PR #33188 I made the mistake of adjusting the version number but forgot to reset the port number. This was also overlooked when reviewing. Since I used x-add-version this time to adjust all the other files, I didn't notice it either, since this way you don't have to manually write the version and port number again.

To Reproduce

• Adjust the version in a vcpkg.json, but keep the old port number (uneven 0 for this test)
• Commit changes
• Call x-add-version => No hint, that the port number is wrong

Expected behavior
When calling x-add-version should check the version json, before adjusting the file:

• New version is equal to previous one? Port number should be previous port numebr + 1
• New version is not equal to previous one? Port number should be 0

In case these rules are violated the vcpkg-tool should reject to adjust the files.

Note: This should be also checked the CI (comparing just the last two versions as I believe you can't fix older issues).