Fix lineage entities sharing mutable defaults across instances

[keith991001]

The attrs entities in airflow.providers.common.compat.lineage.entities declare bare mutable defaults (tags: list[Tag] = [], extra: dict[str, Any] = {}). With @attr.s(auto_attribs=True) such a default is evaluated once and shared class-wide, so mutating one instance silently mutates every other instance:

t1 = Table(database="db", cluster="c", name="t1")
t2 = Table(database="db", cluster="c", name="t2")
t1.tags.append(Tag(tag_name="pii"))
t2.tags  # [Tag(tag_name='pii')] — polluted
t1.tags is t2.tags  # True

This affects Table.tags / columns / owners / extra and Column.tags, i.e. lineage metadata can leak between unrelated entities whenever more than one is constructed. Found while writing the missing test module for this file (#72506).

The fix switches the five defaults to attr.Factory(list) / attr.Factory(dict). Regression tests assert per-instance isolation and fail on the previous code.

Note: #72506 (in flight) adds broader coverage for the same module in the same test file; whichever lands second will be rebased.

related: #35442

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

• Yes — Claude Code (Fable 5)

Generated-by: Claude Code (Fable 5) following the guidelines

[potiuk]

cc: @kacpermuda @mobuchowski ? Do you think there are no side effects (or rather that we get rid of them) ?

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.