docs: Automated documentation sync from recent commit changes

[deepalak56]

Description

This PR contains automated documentation updates generated by the bazel-doc-agent. It synchronizes the
DevSite (site/en) and Mintlify (docs/) documentation with recently merged public-facing features,
behavioral changes, and bug fixes.

A total of 13 documentation updates were applied across the following areas:

• C++ & Toolchains: Documented new toolchain features for path mapping in the C++ toolchain
  configuration reference.
• Execution & Test:
  • Updated bazel run documentation to clarify that targets will now execute even if the BES upload
    fails.
  • Updated the Test Encyclopedia to document that --test_env / env= can now override coverage
    environments.
• Remote Execution & Caching:
  • Added documentation for RRCC symlinks prefetching.
  • Documented the fix for crashes related to duplicate keys in --remote_default_exec_properties.
• Platform Specific:
  • Windows: Added known issues regarding include verification being made aware of Windows
    case-insensitivity.
  • macOS: Updated sandboxing documentation to reflect macOS getconf server fixes.
  • Apple: Removed documentation for the deleted --ios_simulator_version and --ios_simulator_device
    flags.
• Query & Starlark:
  • Added documentation for a new query option that displays full Starlark rule paths.
  • Documented the inclusion of rctx.os.{name,arch} in the pre-declared inputs hash for external
    repositories.
• Deprecations & Cleanups: Documented the removal of
  --experimental_filter_library_jar_with_program_jar and output_library_merged_assets.

(Note: 20+ commits were audited but intentionally skipped by the agent as they were identified as
internal refactorings, tooling changes, or undocumented test flags).

Checklist

• I have added tests for the new use cases (if any).
• I have updated the documentation (if applicable).

Release Notes

RELNOTES: None.