chore!: enable --windows_enable_symlinks by default

[rickeylev]

Supporting Windows without full symlink support is quite difficult because we rely on symlinks in many places. Since Windows support is mediocre already, just require symlinks to be enabled. Symlink support in Windows has been around for a long time now and is available via non-admin mechanisms such as DevMode.

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Summary of Changes

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This pull request streamlines Bazel's operation on Windows by mandating full symlink support. By enabling the --windows_enable_symlinks flag by default, the project simplifies its codebase and development efforts, as symlinks are fundamental to various Bazel functionalities. This change removes the complexity of supporting environments with limited symlink capabilities, leading to a more consistent and robust experience for Windows users who have symlink support enabled.

Highlights

• Default Symlink Requirement on Windows: The --windows_enable_symlinks flag is now enabled by default in .bazelrc for Windows users, making full symlink support a requirement due to its extensive use in Bazel's operations (runfiles, venvs). This change simplifies Windows support by removing the need to handle environments without full symlink capabilities.
• Changelog Update for Breaking Change: The CHANGELOG.md has been updated to reflect this change as a breaking change, advising users to explicitly add startup --windows_enable_symlinks to their .bazelrc if they encounter issues, ensuring compatibility with the new default behavior.

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Changelog

• .bazelrc
  • Added a new startup flag startup --windows_enable_symlinks to enable full symlink support on Windows by default.
  • Included comments explaining the rationale behind requiring symlinks due to their extensive use in Bazel.
• CHANGELOG.md
  • Introduced a new 'Breaking' change entry under the 'Changed' section.
  • Documented that --windows_enable_symlinks is now required and provided guidance for users to update their .bazelrc.

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