chore: Update MeetingTemplate embeddings on insert

[Dschoordsch]

The trigger was only installed on update, but needs to run on insert as well. Because we did not have a release yet, I decided to simplify the change by modifying the last migration.

Demo

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Testing scenarios

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• Scenario A

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• Scenario B

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Final checklist

• I checked the code review guidelines
• I have added Metrics Representative as reviewer(s) if my PR invovles metrics/data/analytics related changes
• I have performed a self-review of my code, the same way I'd do it for any other team member
• I have tested all cases I listed in the testing scenarios and I haven't found any issues or regressions
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• I added the label Skip Maintainer Review Indicating the PR only requires reviewer review and can be merged right after it's approved if the PR introduces only minor changes, does not contain any architectural changes or does not introduce any new patterns and I think one review is sufficient'
• PR title is human readable and could be used in changelog