Fix CI: remove two dead symbols left behind by dead code removal PRs

[Copilot]

Two unused linter errors introduced by recent dead code removal PRs broke CI on main.

Changes

• pkg/parser/schema_validation.go: Remove schemaValidationLog and its logger import — the validator functions that used this var were deleted in dead14 but the declaration was left behind
• pkg/cli/docker_images.go → docker_build_integration_test.go: Move isDockerAvailable() into the integration test file where it's actually called — the function was invisible to the linter because its only call sites are under //go:build integration

Original prompt

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This section details on the original issue you should resolve

<issue_title>Main failing</issue_title>
<issue_description>The CI on main has been failing snce 3b2b765

Fix this - it may be WASM of something like that. Code that is needed may have been removed in one or more of the dead code removal PRs that have gone into in main</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Main failing #18854

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