fix: preserve quoted multipart ETags

[overtrue]

Summary

• Build Complete Multipart Upload XML with DOM text nodes so quoted ETags stay as plain text.
• Add regression coverage for quoted multipart ETags.
• Run Pint formatting to satisfy the existing git hooks.

Fixes #24

Tests

• composer test
• composer check-style

[Copilot]

Pull request overview

This PR addresses COS multipart completion failures by ensuring quoted multipart ETags are serialized as plain text (not wrapped/altered by the XML builder), and aligns the codebase with existing Pint formatting expectations.

Changes:

• Replace markUploadAsCompleted() XML generation with a DOM-based builder to preserve quoted ETags.
• Add a regression test asserting quoted ETags remain quoted in the Complete Multipart Upload XML body.
• Apply Pint-driven formatting changes (including test method renames and small style-only updates across src/ and tests/).

Reviewed changes

Copilot reviewed 18 out of 22 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/SignatureTest.php	Rename tests to Pint-preferred snake_case.
tests/ServiceClientTest.php	Rename test to snake_case for Pint compliance.
tests/ObjectClientTest.php	Update multipart completion expectations and add regression coverage for quoted ETags.
tests/JobClientTest.php	Rename tests to snake_case for Pint compliance.
tests/Http/ResponseTest.php	Rename tests to snake_case for Pint compliance.
tests/ConfigTest.php	Rename tests to snake_case for Pint compliance.
tests/ClientTest.php	Rename tests to snake_case for Pint compliance.
tests/CiClientTest.php	Rename tests to snake_case for Pint compliance.
tests/BucketClientTest.php	Rename tests to snake_case for Pint compliance.
src/Traits/CreatesHttpClient.php	Style-only formatting change (brace alignment).
src/Signature.php	Constructor formatting tightened (single-line empty body).
src/ServiceClient.php	Style-only formatting change (brace alignment).
src/ObjectClient.php	Implement DOM-based Complete Multipart Upload XML builder and wire it into markUploadAsCompleted().
src/Middleware/CreateRequestSignature.php	Constructor formatting tightened (single-line empty body).
src/Http/Response.php	Inline no-op ArrayAccess mutators for formatting consistency.
src/Exceptions/InvalidConfigException.php	Convert empty exception class body to one-liner.
src/Exceptions/InvalidArgumentException.php	Convert empty exception class body to one-liner.
src/Exceptions/Exception.php	Convert empty exception class body to one-liner.
src/Config.php	Constructor formatting tightened (single-line empty body) + style-only brace alignment.
src/Client.php	Import Mockery interfaces, adjust return types, and minor instantiation style change.
src/BucketClient.php	Style-only formatting change (brace alignment).
composer.json	Style-only formatting change (brace alignment).

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