docs: add Go third-party notices

[dillon-zheng]

What problem does this PR solve?

No issue. This is a draft, documentation-only compliance artifact.

What is changed and how it works?

Adds a self-contained root ThirdPartyNotices.txt for the Go dependency graph.

• Scope: Linux/amd64 go list -deps ./..., with tests excluded.
• Excludes the Go standard library and first-party github.com/pingcap/ and github.com/tikv/ modules.
• Source commit: 9f6ebb7edc26ca0ba53b9f4a70de22388f865910.
• Generator: us-docker.pkg.dev/pingcap-testing-account/internal/test/notice-generator@sha256:60fd803ae1ff5d74cc158cc9190d27c2b0bef4b892bcbe8d9b7de0c1ae2252d5 (Go 1.25.12, go-licenses v1.6.0).
• The strict collector check passed. The renderer preserves the BSD-3-Clause evidence in Prometheus's vendored goautoneg README when go-licenses save omits it.

Check List

Tests

• No code
  • Ran the strict Go-license collector check for Linux/amd64 ./....
  • Verified 108 components and a self-contained rendered notice with no generator-local paths or raw collector URLs.

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.34%. Comparing base (9f6ebb7) to head (60dcf67).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2731      +/-   ##
==========================================
- Coverage   42.43%   42.34%   -0.09%     
==========================================
  Files         426      426              
  Lines       47364    47364              
==========================================
- Hits        20096    20052      -44     
- Misses      24570    24613      +43     
- Partials     2698     2699       +1     

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