feat(cli-module-actions): improve CLI formatting, help output, and UX (#33517)

* fix(cli-module-actions): show schema flags in execute --help

When an action ID is provided with --help, fetch the action schema and
display action-specific flags. Falls back to generic help if auth fails.

Signed-off-by: benjdlambert <ben@blam.sh>

* fix(cli-module-actions): show schema flags in execute --help and fix build errors (#33518)

* feat(cli-module-actions): improve CLI output formatting and UX

- Pretty grouped list output with colored headers and action titles
- Custom help rendering for execute --help with markdown descriptions
- Support complex schema types (object, array, union) as JSON flags
- Show server error details instead of generic status codes
- Accept multiple plugin IDs in sources add/remove

Signed-off-by: benjdlambert <ben@blam.sh>

* fix(cli-module-auth): preserve instance metadata on re-login

Signed-off-by: benjdlambert <ben@blam.sh>

* fix: address code review feedback

- Extract triplicated cli() config into showGenericHelp helper
- Strip ANSI escape sequences before rendering server markdown
- Configure marked-terminal extension once via lazy singleton
- Parallelize listGrouped HTTP requests with Promise.all
- Log actual error message in execute help catch block
- Fix marked version in declarations.d.ts comment
- Add tests for sourcesAdd/sourcesRemove batch operations
- Add test for execute JSON parse error path
- Add tests for login metadata preservation on re-auth

Signed-off-by: benjdlambert <ben@blam.sh>

* fix: use RegExp constructor to satisfy no-control-regex lint rule

Signed-off-by: benjdlambert <ben@blam.sh>

* fix: improve ANSI stripping, default info.usage, add renderMarkdown comment

- Extend stripAnsiEscapes to cover OSC, DCS, APC, PM sequences
- Default info.usage to avoid undefined in help output
- Document why marked.use() is called per invocation

Signed-off-by: benjdlambert <ben@blam.sh>

* fix: use strip-ansi, fresh Marked instance, add allOf support

- Replace hand-rolled ANSI stripping with strip-ansi package
- Use fresh Marked instance per call instead of mutating global singleton
- Add allOf to complex type detection alongside anyOf/oneOf
- Add happy-path test for valid JSON complex flag parsing
- Bump changeset to minor for new user-facing capabilities

Signed-off-by: benjdlambert <ben@blam.sh>

* refactor: collapse listGrouped into list on ActionsClient

Signed-off-by: benjdlambert <ben@blam.sh>

* refactor: clean up cli-module-actions structure

- Extract shared pluginSourcesSchema into lib/pluginSources.ts
- Merge schemaToFlags and getComplexKeys into single return value
- Move CleyeFlag-to-FlagInfo conversion into format.ts
- Extract parseArgs and showActionHelp from execute command body

Signed-off-by: benjdlambert <ben@blam.sh>

---------

Signed-off-by: benjdlambert <ben@blam.sh>
Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>

.changeset/fix-auth-login-metadata.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli-module-auth': patch
+---
+
+Fixed `auth login` clearing previously configured action sources and other instance metadata when re-authenticating.

.changeset/fix-execute-help-schema-flags.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli-module-actions': minor
+---
+
+Added improved CLI output formatting and UX for the actions module. The `list` command now groups actions by plugin source with colored headers and action titles. The `execute --help` command renders full action details including markdown descriptions. Complex schema types like objects, arrays, and union types are now accepted as JSON flags. Error messages from the server are now surfaced directly. The `sources add` and `sources remove` commands accept multiple plugin IDs at once.