fix: migrations to make postgresql compatible.

[qasimgulzar]

Description

To support postgresql with edx-platform, I have fixed couple of migrations to make them compatible with postgresql. I also have open 3 subsequent PRs required to be merged before this PR.

Subsequent Pull Requests

1. edx-when
2. edx-enterprise
3. xblock-lti-consumer
4. edx-milestones
5. openedx-learning

[openedx-webhooks]

Thanks for the pull request, @qasimgulzar!

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[qasimgulzar]

@ormsbee I am waiting on it's subsequent PRs to be merged before moving ahead for further implementations.

[qasimgulzar]

Update.-.1.1.-.min.mov

[qasimgulzar]

I will take care of the broken tests