Merge pull request #33381 from backstage/blam/actions-cli

feat(cli): add actions CLI module for distributed actions registry

.changeset/add-actions-cli-module.md

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+---
+'@backstage/cli-module-actions': patch
+---
+
+Added `actions` CLI module for listing and executing actions from the distributed actions registry. Includes `actions list`, `actions execute`, and `actions sources` commands for managing plugin sources.

.changeset/allow-user-action-invocation.md

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+---
+'@backstage/backend-defaults': minor
+---
+
+The actions registry invoke endpoint now accepts direct user credentials in addition to service principals, enabling CLI and other direct user clients to invoke actions.

.changeset/auth-module-exports.md

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+---
+'@backstage/cli-module-auth': patch
+---
+
+Export auth helper utilities for use by other CLI modules. Added per-instance config storage with `getInstanceConfig` and `updateInstanceConfig`.

.changeset/cli-defaults-actions.md

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+---
+'@backstage/cli-defaults': patch
+---
+
+Added `@backstage/cli-module-actions` to the default set of CLI modules.