* Task-level actions for job submissions and retrieval

* FIXME: Temporary workaround to get ember dev server to pass exec through to 4646

* Update api/tasks.go

Co-authored-by: Tim Gross <tgross@hashicorp.com>

* Update command/agent/job_endpoint.go

Co-authored-by: Tim Gross <tgross@hashicorp.com>

* Diff and copy implementations

* Action structs get their own file, diff updates to behave like our other diffs

* Test to observe actions changes in a version update

* Tests migrated into structs/diff_test and modified with PR comments in mind

* APIActionToSTructsAction now returns a new value

* de-comment some plain parts, remove unused action lookup

* unused param in action converter

---------

Co-authored-by: Tim Gross <tgross@hashicorp.com>

* unused param in action converter

* backing out of parse_job level and moved toward new endpoint level

* Adds taskName and taskGroupName to actions at job level

* Unmodified job mock actions tests

* actionless job test

* actionless job test

* Multi group multi task actions test

* HTTP method check for GET, cleaner errors in job_endpoint_test

* decomment

* Working demo for review purposes

* removal of cors passthru for websockets

* Remove job_endpoint-specific ws handlers and aimed at existing alloc exec handlers instead

* PR comments adressed, no need for taskGroup pass, better group and task lookups from alloc

* early return in action validate and removed jobid from req args per PR comments

* todo removal, we're checking later in the rpc

* boolean style change on tty

* Action command init and stuck-notes

* Conditional reqpath to aim at Job action endpoint

* De-logged

* General CLI command cleanup, observe namespace, pass action as string, get random alloc w group adherence

* tab and varname cleanup

* Remove action param from Allocations().Exec calls