[WIP] Create separate PR for validation change

[Copilot]

• Create .ci/scripts/check-support-links.sh - audit script for manual/CI checks
• Create .ci/vale/styles/InfluxDataDocs/SupportLink.yml - Vale rule for support links
• Update lefthook.yml - add pre-commit hook check for support links
• Update DOCS-CONTRIBUTING.md - add InfluxData Support links guidelines
• Test and verify all validation changes work correctly

Summary

This PR extracts only the validation/enforcement changes from PR #6867, creating a separate PR as requested. It adds mechanisms to enforce the standard support link format (https://support.influxdata.com without trailing slash or path).

Changes:

• ✅ Audit script for CI/manual link checking
• ✅ Vale linting rule for automated style checking
• ✅ Pre-commit hook to catch issues before commit
• ✅ Documentation guidelines for contributors

Testing:

• ✅ Audit script successfully identifies non-standard links
• ✅ Pre-commit hook configuration verified
• ✅ Vale rule syntax validated

Note: This PR does NOT include content fixes - it only adds the enforcement tools. The content fix from PR #6867 (query-log.md) can remain in that PR or be handled separately.

Original prompt

Pull request: https://github.com/influxdata/docs-v2/pull/6867/files

create a separate PR for the validation change

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