refactor: Removed uagents as submodule

Removed uagents submodule

Code Review Checklist (to be filled out by reviewer)

[x] Description accurately reflects what changes are being made.
[x] Either the PR references an issue (via the "Development" combobox) or the description explains the need for the changes.
[x] The PR appropriately sized.
[x] The PR contains an idempotent DB migration.
[x] I have verified the correctness of the DB migration using relevant data (e.g. test-generated data).
[x] New code has enough tests.
[x] New code has enough documentation to answer "how do I use it?" and "what does it do?".
[x] Existing documentation is up-to-date, if impacted.