feat: add PSScriptAnalyzer linter aspect

[kain88-de]

Adds PSScriptAnalyzer as a bring-your-own linter following the yamllint/ rubocop pattern. Includes the Bazel aspect, a PowerShell wrapper script that produces both human-readable and SARIF output in a single pwsh invocation, and a working example workspace under examples/powershell/.

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Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

New linter: PSScriptAnalyzer (PowerShell)
Added lint_ps_script_analyzer_aspect for linting PowerShell (.ps1, .psm1) files with PSScriptAnalyzer. Follows the bring-your-own pattern — users supply pwsh,
PSScriptAnalyzer, and ConvertToSARIF via http_archive. See examples/powershell/ for a complete setup.
auto fix for formatting violations

Test plan

• Covered by existing test cases
• New test cases added -> added good and bad examples

[CLAassistant]

All committers have signed the CLA.

[aspect-workflows]

Bazel 7 (Test)

6 test targets passed

Targets

//format/test:custom_args_test [k8-fastbuild] 432ms
//format/test:ls-files_test [k8-fastbuild]    937ms
//lint/rust:test_human [k8-fastbuild]         206ms
//lint/rust:test_patch [k8-fastbuild]         201ms
//lint/rust:test_sarif [k8-fastbuild]         466ms
//tools/sarif:sarif_test [k8-fastbuild]       148ms

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Bazel 8 (Test)

All tests were cache hits

6 tests (100.0%) were fully cached saving 1s.

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Bazel 9 (Test)

All tests were cache hits

6 tests (100.0%) were fully cached saving 1s.