[DX-3667] Codeowners Cleanup

[kalverra]

• Uses trailing slashes for less-ambiguous assignments. This prevents odd behavior with some systems or new files.
• Cleans up some dead or typoed lines

Here's the full effective changes when it comes to ownership.

Changed ownership:
  .github/workflows/devenv-compat.yml                @smartcontractkit/devex-cicd -> @smartcontractkit/devex-tooling
  .github/workflows/devenv-core-compat.yml           @smartcontractkit/devex-cicd -> @smartcontractkit/devex-tooling
  /core/services/ocr2/plugins/s4/                    @smartcontractkit/foundations -> @smartcontractkit/dev-services

[github-actions]

✅ No conflicts with other open PRs targeting develop

[Copilot]

Pull request overview

Risk Rating: MEDIUM — changes affect CODEOWNERS precedence and therefore review/approval routing for multiple paths.

This PR updates repository ownership rules to be less ambiguous (mostly by adding trailing slashes / fixing paths) and removes stale CODEOWNERS entries.

Changes:

• Normalize many CODEOWNERS patterns to directory-scoped rules (trailing /) and correct several paths.
• Remove CODEOWNERS entries that point to non-existent files/paths (e.g., old workflow names, old internal/config/..., and a non-existent deployment/ccip/changeset/ton path).
• Adjust .github/copilot-instructions.md by removing the “Reviewer Recommendations” section and renumbering subsequent sections.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/copilot-instructions.md	Removes the “Reviewer Recommendations” guidance section and renumbers “Code Style” to section 3.
.github/CODEOWNERS	Cleans up and normalizes ownership patterns (adds trailing slashes, fixes paths, removes stale entries), and introduces a wildcard rule for devenv* workflows.

[Copilot]

The PR description says devenv-compat.yml and devenv-core-compat.yml ownership changes from @smartcontractkit/devex-cicd to @smartcontractkit/devex-tooling, but the new rule /.github/workflows/devenv* still includes @smartcontractkit/devex-cicd (and @smartcontractkit/core). If the intent is to move primary/sole ownership to devex-tooling, remove devex-cicd/core from this pattern or add file-specific rules that match the stated ownership changes.