fix: User profile not found on account creation

[bmtcril]

Sometimes the user profile sink would get run before the transaction creating the target row was committed in the LMS. This led to UserProfileNotFound errors and the data not making its way to ClickHouse. This delays creating the task until the transaction is committed.

Closes: #54

Merge checklist: Check off if complete or not applicable:

• [x] Version bumped
• [x] Changelog record added
• [x] Fixup commits are squashed away

[github-actions[bot]]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
platform_plugin_aspects
__init__.py
signals.py
xblock.py
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[saraburns1]

lgtm!