[dagster-airlift] Move around classes

[dpeng817]

Summary & Motivation

This file was getting too big and is about to get bigger. Move around non-serialized airflow representations to a different file.

How I Tested These Changes

Existing tests

[dpeng817]

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• [dagster-airlift][jobs 4/n] Definitions.execute_job_in_process #29243 : 2 dependent PRs (#29209 , #29277 )
• [dagster-airlift][jobs 3/n] make AirflowDefinitionsData aware of jobs #29208
• [dagster-airlift][jobs 2/n] Job builder methods #29207
• [dagster-airlift][jobs 1/n] move assets def construction to common code path; other refactors #29206
• [dagster-airlift][datasets 3/3] dataset filtering #29164
• [dagster-airlift][datasets 2/3] auto-construct assets from datasets #29162
• [dagster-airlift][datasets 1/3] datasets storage layer, AirflowInstance retrieval methods #29155
• [dagster-airlift] Move around classes #29154 👈 (View in Graphite)
• [dagster-airlift] fix prop on AirflowDefinitionsData #29161
• master

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[graphite-app]

There's a circular import issue here: airflow_instance.py imports from runtime_representations.py and now runtime_representations.py imports from airflow_instance.py.

To resolve this, consider either:

1. Moving TERMINAL_STATES to a common module that both can import
2. Defining TERMINAL_STATES in runtime_representations.py and importing it in airflow_instance.py instead
3. Passing TERMINAL_STATES as a parameter when creating DagRun instances

This will maintain clean dependency structure and prevent potential import-time issues.

Suggested change

	@property
	def finished(self) -> bool:
	from dagster_airlift.core.airflow_instance import TERMINAL_STATES
	return self.state in TERMINAL_STATES
	@property
	def finished(self) -> bool:
	from dagster_airlift.core.constants import TERMINAL_STATES
	return self.state in TERMINAL_STATES

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