docs: update documentation for .bazelrc import depth, Bzlmod integrity enforcement, remote cache CDC, and BEP ordering

[Copilot]

Documents four new behavioral changes in Bazel across four topic areas.

Changes

• .bazelrc import depth (run/bazelrc.md, run/bazelrc.mdx): Documents the new 512-file recursive import depth limit, the "Maximum import depth exceeded parsing config file" error, and the BAZEL_UNLIMITED_IMPORT_DEPTH escape hatch.

• Bzlmod integrity enforcement (external/registry.md, external/registry.mdx): Clarifies that integrity checksum values for patches and overlay entries in source.json must now be non-empty. Covers all three source types (archive, git_repository).

• Remote cache chunked transfer (remote/caching.md, remote/caching.mdx): Adds a "Chunked transfer" subsection documenting --experimental_remote_cache_chunking for large blob transfers. Notes server-side support requirement.

• BEP parent-child ordering (remote/bep.md, remote/bep.mdx): Replaces the old caveat that parent events might precede children with the new guarantee that BEP events respect parent-child ordering constraints.

All changes are mirrored identically between legacy .md (site/en/) and modern .mdx (docs/) files.

Build API Changes

No

Checklist

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

Release Notes

RELNOTES: None

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