[16.0] queue_job: unify no delay option

[simahawk]

Current situation:

• multiple keys for no good reason
• half baked: not all of them used everywhere
• no centralization
• poor naming

With this change we'll have:

• 1 and only one key to disable via ctx: queue_job__no_delay
• 1 and only one key to disable via os env: QUEUE_JOB__NO_DELAY
• backward compatibility with deprecation for old keys

[OCA-git-bot]

Hi @guewen,
some modules you are maintaining are being modified, check this out!

[grindtildeath]

Looks good overall. Is there any reason to use a double underscore in the name of ctx key and env var?
IMO it would be better to have a single underscore as in QUEUE_JOB_NO_DELAY to avoid potential troubles because it's not something that's easy to detect if you accidentally write only one.

[simahawk]

Actually the env var has 2 underscores too. TBH this is just an approach I'm taking to identify keys by module especially if the are meant to be used in many many modules. So the __ is just to separate the name explicitly.
I can change that of course.

[guewen]

/ocabot merge minor

[OCA-git-bot]

This PR looks fantastic, let's merge it!
Prepared branch 16.0-ocabot-merge-pr-521-by-guewen-bump-minor, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at 216fe43. Thanks a lot for contributing to OCA. ❤️