[FEATURE] Allow to push unchecked history
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### Summary
When packages are dropped from the official repos they do not (neccesarily) have a `.SRCINFO` file for every commit.
It would therefore be good to disable checks for all commits and only check the validity of the latest commit instead.
### Description
As we already discussed on IRC it would be great if Package Maintainers could disable the checks for the history of a package in some way.
This feature request is related to the discussion in issue https://gitlab.archlinux.org/archlinux/devtools/-/issues/143 regarding the implementation of `pkgctl aur export`.
One way we came up with was a mechanic similar to setting the `AUR_OVERWRITE` env var as described in https://gitlab.archlinux.org/archlinux/aurweb/-/commit/c5302d3a33028f483cc2e01225226d4ae047dd4a.
The referenced commit also mentions `AUR_PRIVILEGED`, maybe that could be reused.
issue