WIP: upgrade to go 1.25.3

[BenTheElder]

Follow up to #35756

This has been a huge mess of issues to work through, apologies for the size of the PR.

Where possible I have pruned dead code rather than continue to patch it and the dependencies it pulls in.

[k8s-ci-robot]

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[BenTheElder]

will resume tomorrow, it's a lot of lint issues

[BenTheElder]

starting to break out some PRs, this is a big mess

first up landing @upodroid's #35448 and #35446 then I'll start to send a series of smaller PRs

[k8s-ci-robot]

@BenTheElder: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-test-infra-misc-image-build-test	12fa7e3	link	true	/test pull-test-infra-misc-image-build-test
pull-test-infra-verify-lint	12fa7e3	link	true	/test pull-test-infra-verify-lint

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[BenTheElder]

I'm not going to attempt to fix up this branch as-is, teasing out useful smaller chunks and then will make a fresh go at the bits that have to merge together