refactor: simplify WriteApi request path

[bednar]

Summary

• Replace generated OpenAPI request plumbing with focused request construction and direct RestClient transport.
• Preserve v2/v3 endpoint selection, precision conversion, gzip, timeout, retry, and error translation behavior.
• Update request-path and Polars tests to assert the RestClient boundary.

Testing

• venv/bin/python -m pytest tests -q -m 'not integration' — 174 passed, 29 deselected
• venv/bin/flake8 influxdb_client_3/write_client/client/write_api.py tests/test_write_api.py tests/test_polars.py
• Integration marker suite: 29 skipped because the integration environment is unavailable.

Closes #229

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.43%. Comparing base (d846df5) to head (b65e6d0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   86.90%   87.43%   +0.53%     
==========================================
  Files          28       28              
  Lines        2084     2030      -54     
==========================================
- Hits         1811     1775      -36     
+ Misses        273      255      -18     

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[Copilot]

Pull request overview

This PR refactors the internal WriteApi write path to construct v2/v3 write requests directly and send them through the internal RestClient, removing leftover generated OpenAPI request plumbing while preserving existing write behaviors and updating tests to assert the RestClient boundary.

Changes:

• Replace generated-style request preparation (call_api / _post_write_prepare / serialization helpers) with _build_write_request(...) + _request(...) using RestClient.
• Update unit tests (including Polars) to validate request construction and mock rest_client.request instead of call_api.
• Update the changelog to mention the additional simplification of the WriteApi request path.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
influxdb_client_3/write_client/client/write_api.py	Removes generated OpenAPI request plumbing and routes write requests through _build_write_request + RestClient.
tests/test_write_api.py	Adds request-matrix coverage for _build_write_request and adjusts mocks to the RestClient boundary.
tests/test_polars.py	Updates Polars write tests to mock/assert rest_client.request calls and payload forwarding.
CHANGELOG.md	Notes further write-path simplification via direct RestClient request construction.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

influxdb_client_3/write_client/client/write_api.py:690

• _build_write_request raises errors that say "when calling _post_write", but the validation is happening inside _build_write_request. Using the correct method name makes errors clearer, especially when this helper is called directly in tests or from post_write_async.

        if org is None:
            raise ValueError("Missing the required parameter `org` when calling `_post_write`")
        if bucket is None:
            raise ValueError("Missing the required parameter `bucket` when calling `_post_write`")

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.