refactor: Clean up dead code, typos, and storage-client internals

[vdusek]

A round of cleanup ahead of the major release.

Dead code

Removed _was_final_persist_state_emitted, is_url(), maybe_extract_enum_member_value(), EXIT_CODE_SUCCESS, a no-op except Exception: raise in _crypto.py, the pre-impit hpack/httpcore Scrapy loggers, and a discarded get() call in the alias resolver (plus the now-orphaned tests).

Env-var enums

Added the four vars Configuration reads but Actor.get_env() was silently omitting: ACTOR_STORAGES_JSON, ACTOR_TEST_PAY_PER_EVENT, APIFY_ACTOR_PRICING_INFO, APIFY_CHARGED_ACTOR_EVENT_COUNTS.

Packaging

Dropped the 8 redundant nested py.typed files (the top-level one covers the whole package per PEP 561), added the Typing :: Typed classifier, and removed the stale apify-shared entry from [tool.uv.exclude-newer-package].

Docstrings / typos

Fixed prising→pricing, MIIGRATING→MIGRATING, the nonexistent content_type in call_task, the "in seconds" on timedelta-typed timeout args, the concatenated web_server_port description, the stale "except in Pytest" claim, the stale _AliasResolver references, and the mkdocs cross-refs in events/_types.py.

Storage-client internals

• Added @docs_group to FileSystemStorageClient and a docstring/@docs_group to ApifyRequestQueueMetadata so both render in the API reference.
• AliasResolver now reuses a cached ApifyClientAsync per (token, api_url) instead of creating an unclosed one on every call.
• Renamed hash_api_base_url_and_token → hash_api_public_base_url_and_token to match what it actually hashes.
• Shared request-queue fetch_next_request no longer re-fetches a request it already hydrated.
• push_data([]) returns early instead of POSTing [].
• Documented in the v4 upgrading guide that cloud storage clients raise NotImplementedError on purge() (use drop()).

[codecov]

Codecov Report

❌ Patch coverage is 69.56522% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.69%. Comparing base (0daca28) to head (9c3fab5).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...c/apify/storage_clients/_apify/_alias_resolving.py	50.00%	5 Missing ⚠️
...rc/apify/storage_clients/_apify/_dataset_client.py	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (0daca28) and HEAD (9c3fab5). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (0daca28)	HEAD (9c3fab5)
integration	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #981       +/-   ##
===========================================
- Coverage   89.90%   78.69%   -11.21%     
===========================================
  Files          49       49               
  Lines        3091     3075       -16     
===========================================
- Hits         2779     2420      -359     
- Misses        312      655      +343     

Flag	Coverage Δ
e2e	36.16% <60.86%> (+0.25%)	⬆️
integration	?
unit	78.69% <69.56%> (-0.05%)	⬇️

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