Change aqueduct_demo name to Demo

[kenxu95]

Describe your changes and why you are making these changes

This PR does a number of things;

1. For aethestic purposes, we now call the demo db "Demo" instead of "aqueduct_demo".
2. We delete the "AqueductDemo" service type, which is a vestige of old and never used.
3. We add some logic to aqueduct startup, so that if a SQLite integration named "aqueduct_demo" exists, we'll delete it, with the assumption that the "Demo" entry will be created right afterwards. This, of course, means that we do not allow the user to create SQLite integrations named "aqueduct_demo".
4. The user can still use client.resource("aqueduct_demo") if they want. We'll translate it to "Demo" implicitly for them, after printing out a warning.
5. We remove the blocking of anything named "aqueduct_demo" on the frontend, and instead like the connect_integration route handle the validation. This improves error surfacing.

Related issue number (if any)

ENG-2824

Loom demo (if any)

Checklist before requesting a review

• I have created a descriptive PR title. The PR title should complete the sentence "This PR...".
• I have performed a self-review of my code.
• I have included a small demo of the changes. For the UI, this would be a screenshot or a Loom video.
• If this is a new feature, I have added unit tests and integration tests.
• I have run the integration tests locally and they are passing.
• I have run the linter script locally (See python3 scripts/run_linters.py -h for usage).
• All features on the UI continue to work correctly.
• Added one of the following CI labels:
  • run_integration_test: Runs integration tests
  • skip_integration_test: Skips integration tests (Should be used when changes are ONLY documentation/UI)

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[agiron123]

Frontend should be okay ... I think. I'm still working on getting the new Kubernetes dialog to work with my forms refactor :sadpanda: