[Issue] [vcl] don't explicitly hash the host header

[m2-assistant]

This issue is automatically created based on existing pull request: #28928: [vcl] don't explicitly hash the host header

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Hashing req.http.host/client.ip is already handled by the built-in
vcl
so there's no need to repeat it explicitly.

It's also a bit confusing as req.url is not explicitly handled, even
though it's a more important hash input than the host.

note: all versions have been changed for the sake of consistency
but both the 4.x and 5.x series have been EOL'd a (long) while ago and users
should be encouraged to upgraded as soon as possible.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[magento-engcom-team]

✅ Confirmed by @engcom-Alfa
Thank you for verifying the issue. Based on the provided information internal tickets MC-38459 were created

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