Unable to alter local actions prior to rendering

Problem/Motivation

There are some inconsistencies between how local tasks and local actions are handled.

For local tasks, there are 2 hooks:

• hook_menu_local_tasks_alter() - this allows local tasks to be altered prior to rendering
• hook_local_tasks_alter() - this allows the altering of local task plugins during discovery

For local actions, there is only one hook, and the naming convention is actually the opposite of local tasks:

• hook_menu_local_actions_alter() - allows altering of local action plugins during discovery

Proposed resolution

Introduce a new hook_local_actions_render_alter() executed prior to rendering.
Rename existing hook_menu_local_tasks_alter() to hook_local_tasks_render_alter() for the consistency.

Remaining tasks

Review, commit.

API changes

New hook_local_actions_render_alter() hook is added.
Existing hook_menu_local_tasks_alter() hook is deprecated and renamed to hook_local_tasks_render_alter().

See the change record for more details - https://www.drupal.org/node/3028611.