fix(codegen): skip assertions that depend on an unmapped do-step

[MattDevy]

Summary

• Fixes the FAIL: expected queries = [object Object] and FAIL: expected acknowledged = true failures in the ES functional matrix.
• Root cause: when a do step is skipped because the CLI action isn't registered (or its catch clause is unsupported), $RESPONSE is stale or empty — but the generator still rendered the downstream match / is_true / set / comparison steps, which then asserted against wrong data.
• renderSteps now tracks whether the most recent do produced a response. Assertions/set steps that follow a skipped do are emitted as skip-comments instead of real commands, until the next executed do resets the response. renderDo returns a boolean so the caller knows whether to trust $RESPONSE.

Closes #189.

Scripts previously failing, now clean

• test/functional/es/esql/30_queries.sh — the lone match after the unmapped esql.list_queries is now commented out.
• test/functional/es/ingest/10_basic.sh — four orphan assertions are skipped; the real ingest simulate step and its .docs check still run.

Stack

Based on #190 which is based on #187. Merge order: 187 → 190 → this.

Test plan

• npm run test:unit green (two new tests: one asserts orphan assertions are skipped, one asserts assertions after a mapped do still render)
• Regenerate against ES 9.1.0 locally and confirm both target scripts no longer emit the spurious FAIL lines
• Buildkite ES matrix shows zero expected queries = [object Object] or expected acknowledged = true failures

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	2.62s
✅ REPOSITORY	gitleaks	yes		no	no	8.17s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	1.91s
✅ REPOSITORY	trivy	yes		no	no	13.66s
✅ TYPESCRIPT	eslint	2		0	0	2.24s

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