CPP-2814 feat: add serverless authentication using serverless assume role

[zeinaaabbb]

Description

This PR adds serverless authentication for the teardown steps in the pr-close workflow.

Previously, the teardown step would fail due to a lack of authentication. This introduces serverless-assume-role steps, similar to how we already handle with Hako apps

Checklist:

• My branch has been rebased onto the latest commit on main (don't merge main into your branch)
• My commit messages are conventional commits, for example: feat(circleci): add support for nightly workflows, fix: set Heroku app name for staging apps too

[olusoladavid]

question: Have we tested or used this step anywhere? The docs seem to suggest that the orb exports a setup job that should be used along with a custom executor

[zeinaaabbb]

@olusoladavid, I was tryining to replicate what we have done in here in cloudsmith yaml file?

[ivomurrell]

issue: ah I was wrong actually this command comes from the Tool Kit orb instead of the serverless-framework orb (so we don't need to import the latter orb in the end.) you can access it be using the Tool Kit orb's name as a prefix, like this

Suggested change

	- serverless-assume-role
	- tool-kit/serverless-assume-role

additionally, the command takes two arguments which need to be passed to it for it to work. they can be passed similar to how they are passed to the deploy-* jobs, like this (note you don't need the !toolkit/if-defined line because this is the serverless plugin so those options are always required)

[ivomurrell]

thank you! fingers crossed this will fix it 🤞🤞

[ivomurrell]

issue: these need to use the !tool-kit/option syntax like in the circleci-deploy example