SendGrid - Support secrets backend

[eugenemiretsky]

Description

Allow configuring SendGrid using secrets backend

Use case / motivation

Right now to configure SendGrid one has to set
SENDGRID_MAIL_FROM={your-mail-from}
SENDGRID_API_KEY={your-sendgrid-api-key}

However, one GCP that would mean that the variables need to be added in the UI.

Instead of reading the configs from OS env vars (os.environ.get) the configs should be read as a Variable so that a secrets backend can be used to store them.

Are you willing to submit a PR?

Yes

Related Issues

[boring-cyborg]

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[mik-laj]

Related: #13601

Can you look at it?

[vikramkoka]

@eugenemiretsky Can you please confirm that the above referenced PR closes this?

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[github-actions]

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