refactor: update action parameters and docs

[stormslowly]

Description:
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Related issue:
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Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the action to remove the ability to configure a custom Node.js binary mirror. Instead, it hardcodes the use of the cnpm mirror for all Node.js binary downloads. This change simplifies the action's interface and internal logic, while ensuring faster downloads in certain network environments by leveraging the specified mirror by default.

Highlights

• Removed Mirror Configuration: The mirror and mirror-token inputs have been removed from the action, simplifying its configuration. The action now exclusively uses the cnpm mirror for downloading Node.js binaries.
• Updated Documentation: The README.md and docs/advanced-usage.md have been updated to reflect the removal of the mirror configuration and to explicitly state the use of the cnpm mirror.
• Internal Code Refactoring: The internal distribution logic in src/distributions has been refactored to remove all references and usage of the mirror and mirror-token parameters, streamlining the codebase.

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Changelog

• README.md
  • Added a note indicating the action is a fork and uses the cnpm mirror.
  • Updated the description of Node.js downloading to explicitly mention the cnpm mirror.
  • Removed documentation for the mirror and mirror-token inputs.
  • Updated references to the Node.js distribution source to 'cnpm mirror'.
  • Removed the 'Using private mirror' section.
• action.yml
  • Removed the mirror input.
  • Removed the mirror-token input.
• docs/advanced-usage.md
  • Removed the entire 'Use private mirror' section.
• src/distributions/base-distribution.ts
  • Modified the getDistributionUrl abstract method signature to remove the mirror parameter.
  • Updated getNodeJsVersions to remove the mirror parameter from getDistributionUrl calls and removed mirrorToken from httpClient.getJson headers.
  • Updated getNodeVersionInfo to remove the mirror parameter from getDistributionUrl calls.
  • Modified downloadTool calls to remove the mirrorToken parameter.
  • Updated getLatestNodejsDist to remove the mirror parameter from getDistributionUrl calls.
• src/distributions/base-models.ts
  • Removed the mirror property from the NodeInputs interface.
  • Removed the mirrorToken property from the NodeInputs interface.
• src/distributions/official_builds/official_builds.ts
  • Modified the getDistributionUrl method signature to remove the mirror parameter.
  • Updated the getManifestFromRepo call to remove conditional mirrorToken usage.
• src/main.ts
  • Removed retrieval of the mirror input.
  • Removed retrieval of the mirror-token input.
  • Removed mirror and mirrorToken from the nodejsInfo object passed to getNodejsDistribution.

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[gemini-code-assist]

Code Review

This pull request refactors the action to remove the mirror and mirror-token inputs, hardcoding the use of the cnpm mirror. The changes are consistently applied across the action's definition (action.yml), documentation (README.md, docs/advanced-usage.md), and the core implementation logic. The code is simplified by removing the logic for custom mirrors, and all related function calls and type definitions have been updated accordingly. The changes are correct and align with the goal of creating a dedicated fork for the cnpm mirror.