chore: reduce generated code

[rhamzeh]

Description

Generated from: openfga/sdk-generator#638 using

OPEN_API_REF=0ac19aac54f21f3c78970126b84b4c69c6e3b9a2 OPENAPI_GENERATOR_CLI_DOCKER_TAG=v7.11.0 make build-client-dotnet

What problem is being solved?

How is it being solved?

What changes are made to solve it?

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

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• Create PR with unit tests
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• Commit unit tests in branch chore/reduce-generation

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[Copilot]

Pull Request Overview

This PR reduces generated code size by extracting commonly used constants into a centralized constants file (FgaConstants.cs) and removing redundant file headers from auto-generated files. The changes consolidate magic numbers and string literals used throughout the codebase for hash code calculations, retry configurations, HTTP headers, and other SDK constants into a single, maintainable location.

Key changes:

• Created new FgaConstants.cs file containing SDK-wide constants
• Removed 13-line copyright/auto-generation headers from numerous files
• Replaced hardcoded magic numbers (9661, 9923) and string literals with named constants throughout model classes

Reviewed Changes

Copilot reviewed 163 out of 163 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/OpenFga.Sdk/Constants/FgaConstants.cs	New centralized constants file defining SDK version, retry parameters, HTTP headers, and hash code prime numbers
src/OpenFga.Sdk/Model/*.cs (90+ files)	Replaced magic numbers in GetHashCode() methods with FgaConstants references and removed file headers
src/OpenFga.Sdk/Telemetry/*.cs	Removed file headers and updated to use FgaConstants for header names
src/OpenFga.Sdk/Configuration/Configuration.cs	Updated to reference FgaConstants for version, user agent, and retry limits
src/OpenFga.Sdk/Client/Client.cs	Replaced hardcoded parallel request limits with FgaConstants references
src/OpenFga.Sdk/ApiClient/OAuth2Client.cs	Updated token expiry thresholds to use FgaConstants
.openapi-generator/FILES	Updated to reflect new file structure and removed references to deleted files
CONTRIBUTING.md	Updated contribution guidelines to clarify issue reporting and PR submission process

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