PLX-273: version-gate Houston airflow deprecations

[Simpcyclassy]

Description

Version-gates deprecated Houston API fields (airflowVersion, airflowImages, airflowVersions, defaultAirflowImageTag) so the CLI remains compatible when Houston PR #2423 removes them.

Changes:

• Converted DeploymentInfoRequest and DeploymentImageUpdateRequest from standalone GraphQL strings to version-gated queryList entries. The 1.0.1+ variants omit all deprecated airflow fields.
• Updated GetDeploymentConfig() and UpdateDeploymentImage() to resolve the correct query via GreatestLowerBound(version).
• Removed AirflowVersion from UpdateDeploymentImageResp (unused — the function discards the response).
• Added omitempty to UpdateDeploymentImageRequest.AirflowVersion so it is not serialized when empty.
• Updated TestUpdateDeploymentImage to use runtime-only mock data.

Backward compatibility with older Houston versions is preserved — the pre-1.0.1 query entries still include all airflow fields.

🎟 Issue(s)

Related https://linear.app/astronomer/issue/PLX-273/deprecate-astroruntimeenabled
Related astronomer/houston-api#2423

🧪 Functional Testing

1. make test — all houston, software/deploy, software/deployment, and cmd/software tests pass.
2. make lint — no new lint issues.
3. Against Houston < 1.0.1: CLI should use the old queries that include airflowVersion fields (backward compat).
4. Against Houston >= 1.0.1: CLI should use the new queries that omit deprecated fields. Deploys (image push, BYO registry, dag-only) should succeed without errors.

📋 Checklist

• Rebased from the main (or release if patching) branch (before testing)
• Ran make test before taking out of draft
• Ran make lint before taking out of draft
• Added/updated applicable tests
• Tested against Astro-API (if necessary).
• Tested against Houston-API and Astronomer (if necessary).
• Communicated to/tagged owners of respective clients potentially impacted by these changes.
• Updated any related documentation

[coveralls-official]

Coverage Report for CI Build 0

Coverage increased (+0.002%) to 39.388%

Details

• Coverage increased (+0.002%) from the base build.
• Patch coverage: 4 of 4 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	63194
Covered Lines:	24891
Line Coverage:	39.39%
Coverage Strength:	9.52 hits per line

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💛 - Coveralls

[karankhanchandani]

Thanks for the PR. LGTM.

[pgvishnuram]

LGTM