Add plugin tasks table with insert button to entrypoints page

[keithmanville]

It is currently tedious to manually write entrypoint yaml files. To reduce the workload on the user, add a table to the right of the code editor that lists all plugin tasks associated with the entrypoint. The table should include the plugin name, task name, and insert button at minimum. Additional information can be included if it fits comfortably. The insert button should insert a block of yaml for the task. It should be inserted at the last location of the cursor, or appended to the end.

Definition of done:

• A plugin tasks table is added to the entrypoint creation and edit forms
• The feature is merged into dev