fix(rush): default rush-pnpm query commands to recursive

[kiranmagic7]

Fixes #5035.

What changed

• Defaults rush-pnpm outdated and rush-pnpm why to pass --recursive when the caller has not already provided -r/--recursive or --global.
• Adds unit coverage for default insertion, explicit recursive flags, and global outdated checks.
• Adds a Rush change file for @microsoft/rush.

Why

outdated and why are workspace query commands in Rush repos. Without recursive mode, they can query the wrong importer or no importer; defaulting these two commands to recursive mode matches the workaround discussed in #5035 while preserving explicit caller flags.

Compatibility / risk

This only changes the default flags for rush-pnpm outdated and rush-pnpm why. Explicit recursive flags are preserved, and global outdated checks are left unchanged.

Tests

• RUSH_ALLOW_UNSUPPORTED_NODEJS=1 node common/scripts/install-run-rush.js build --to @microsoft/rush-lib --verbose - passed
• git diff HEAD^..HEAD --check - passed
• RUSH_ALLOW_UNSUPPORTED_NODEJS=1 node common/scripts/install-run-rush.js test --to @microsoft/rush-lib --verbose - the new RushPnpmCommandLineParser.test passed; the full suite failed locally under unsupported Node 25.6.1 due unrelated RushXCommandLine snapshots expecting mocked Node 12.12.12 (LTS) but receiving (unstable).

[kiranmagic7]

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