refactor: Remove dead code and tidy storage-client internals

[vdusek]

Internal cleanup portion of the v4 major-release cleanup. No public API changes.

Dead code

• Remove EXIT_CODE_SUCCESS, is_url(), maybe_extract_enum_member_value(), a no-op except Exception: raise in _crypto, the unused hpack/httpcore Scrapy loggers (leftovers from the old httpx stack — HTTP now goes through impit), the unused _was_final_persist_state_emitted flag, and a discarded default_kvs_client.get() call.

Tidy-ups

• Skip the API call when push_data is given an empty list.
• Rename hash_api_base_url_and_token → hash_api_public_base_url_and_token to match what it hashes.

Packaging

• Add the Typing :: Typed classifier and remove the stale apify-shared entry from [tool.uv.exclude-newer-package].

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.92%. Comparing base (0daca28) to head (405898d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/apify/storage_clients/_apify/_dataset_client.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
+ Coverage   89.90%   89.92%   +0.01%     
==========================================
  Files          49       49              
  Lines        3091     3066      -25     
==========================================
- Hits         2779     2757      -22     
+ Misses        312      309       -3     

Flag	Coverage Δ
e2e	35.97% <42.85%> (+0.06%)	⬆️
integration	57.11% <71.42%> (+0.23%)	⬆️
unit	78.63% <71.42%> (-0.11%)	⬇️

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