[CT-3429] [Bug] Selectors don't apply for sources and seeds in dbt docs generate

[aranke]

Is this a new bug in dbt-core?

• I believe this is a new bug in dbt-core
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

Following up from #9159, if there are multiple seeds or sources in a dbt project and a selector is used, catalog.json should only contain the seeds or sources that match selection criteria (which is currently ignored).

Expected Behavior

The selection criteria above are respected.

Steps To Reproduce

1. Add seeds my_first_seed and my_second_seed to project and run dbt seed
2. Run dbt docs generate --select my_first_seed
3. Inspect catalog.json to find that my_second_seed is in there even though it shouldn't be

Relevant log output

No response

Environment

- OS: MacOS (applies to all)
- Python: 3.11
- dbt: 1.7
- adapter: Postgres, but probably applies to all

Which database adapter are you using with dbt?

postgres

Additional Context

Acceptance Criteria:

1. Fix TODOs here:

   dbt-core/tests/functional/docs/test_generate.py

   Lines 90 to 100 in 201d75b

   	class TestGenerateSelectSource(TestBaseGenerate):
   	def test_select_source(self, project):
   	run_dbt(["build"])
   	catalog = run_dbt(["docs", "generate", "--select", "source:test.my_seed.sample_seed"])
   	# 2 seeds
   	# TODO: Filtering doesn't work for seeds
   	assert len(catalog.nodes) == 2
   	# 2 sources
   	# TODO: Filtering doesn't work for sources
   	assert len(catalog.sources) == 2

2. Document other node types that selectors haven't been tested against

[aranke]

Follow-up from technical refinement:

1. Apply all selectors from other commands to docs generate

Follow-up from pointing:

1. Refine scope to sources and seeds