Require condition on multi-table update triggers at validate time

[yuri-rod]

Changes

New read-only check that errors when a job trigger lists more than one table in table_names without setting condition. Registered in FastValidate so both bundle validate and bundle deploy catch it.

Why

Validate passed jobs the Jobs API rejects at deploy with a 400 after files are uploaded. Fixes #7101.

Error severity is deliberate: this shape always fails at deploy, so no working bundle can break.

Tests

• New unit tests for missing, set, single-table, and no-trigger cases
• Full bundle/config/validate package passes
• Rebuilt binary: missing condition errors with path and file location; condition-set and single-table variants pass
• Trigger-related acceptance subtests pass (18 invariant subtests, config-remote-sync/job_fields)

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[yuri-rod]

Self-review follow-up in 663c8e9: the first version only checked the singular trigger block, but JobSettings.triggers entries use the same TableUpdateTriggerConfiguration type and the API applies the same condition requirement there, so those entries are now checked too (reported at resources.jobs.<name>.triggers[i].table_update). Also added tests for the plural path and the ALL_UPDATED value. Package tests and repo-pinned golangci-lint pass.

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• PR number: 7107
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