Template every connection id accepted by provider operators

[shahar1]

closes: #35259

Human Summary

I've figured out that it would be easier and better to add all conn_id at once as template fields to all operators, as the original issue suggests, rather than managing a "burn-out" operation like we did in #70296. It is a very quick fix, and I don't want to spend days reviewing AI PRs that do it over and over again. To ensure that it is being enforced, also added a pre-commit for that.

AI Summary

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Connection ids are meant to be templatable (`conn_id="{{ params.conn_id }}"`), but coverage across providers was uneven: 331 of 1144 provider classes with `template_fields` listed their `*conn_id` argument, the rest did not, and many subclasses that redefine `template_fields` silently dropped the parent's connection id.

Commit 1 adds every *conn_id argument to template_fields where templating can take effect (523 entries across 237 files, 59 providers). Arguments read in __init__ or stored under a different attribute name (e.g. SparkSubmitOperator keeps _conn_id) are left alone since rendering would not reach them. Six Vertex AI operators gain an explicit gcp_conn_id parameter forwarded to the base class so validate-operators-init sees a plain assignment. Five tests asserting exact tuples are updated.

Commit 2 adds the check-conn-id-templated prek hook (providers config) so this does not erode. It parses the provider tree once, resolves template_fields across the inheritance chain the way Python does (literal tuples, *Parent.template_fields, tuple({...} | set(Parent.template_fields)), aws_template_fields(...)), and reports any *conn_id __init__ argument, own or inherited, that the resolved fields miss. Arguments templating cannot act on are skipped. Runs in ~6 s on the full tree, only parses files containing conn_id. Covered by 16 unit tests under scripts/tests/ci/prek/.

Verified with breeze run mypy on the touched files, the runtime superset check of every edited class, and the template_fields tests of all 59 providers.

related: #35259

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Was generative AI tooling used to co-author this PR?

• Yes — Claude Code (Fable 5.1)

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