feat: pass required context for instructor emails

[DmytroAlipov]

This is a backport from the master branch.

Pass required context to bulk enrollment emails:

• logo_url
• homepage_url
• dashboard_url

Add additional context for enrollment emails:

• contact_email
• platform_name

There is no required context for openedx/core/djangoapps/ace_common/templates/ace_common/edx_ace/common/base_body.html:

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[mphilbrick211]

Hi @navinkarkera! I think you're reviewing the master PR for this. Would you mind looking at this backport after?

[DmytroAlipov]

Hi @mphilbrick211 Is it possible to have someone review this MR so that this fix can be included in Quince 3?

[mphilbrick211]

Hi @mphilbrick211 Is it possible to have someone review this MR so that this fix can be included in Quince 3?

Hi @navinkarkera! Following up on this to see if you could review?

[navinkarkera]

@mphilbrick211 Yes, once master PR is merged and I'll review and merge this one. cc: @DmytroAlipov