Python format uses `{Variable}` as the variable placeholder, while Jinja
uses `{{Variable}}` as its default.
Jinja is used as the main templating engine on the system, but the
Python format version is still maintained for backward compatibility.
However, the backward compatibility support can cause a side effect
while passing JSON string value into the block that uses it:
https://github.com/Significant-Gravitas/AutoGPT/issues/9194
### Changes 🏗️
* Use `{{Variable}}` place holder format and removed `{Variable}`
support in these blocks:
- '363ae599-353e-4804-937e-b2ee3cef3da4', -- AgentOutputBlock
- 'db7d8f02-2f44-4c55-ab7a-eae0941f0c30', -- FillTextTemplateBlock
- '1f292d4a-41a4-4977-9684-7c8d560b9f91', -- AITextGeneratorBlock
- 'ed55ac19-356e-4243-a6cb-bc599e9b716f' --
AIStructuredResponseGeneratorBlock
* Add Jinja templating support on `AITextGeneratorBlock` &
`AIStructuredResponseGeneratorBlock`
* Migrated the existing database content to prevent breaking changes.
### Checklist 📋
#### For code changes:
- [ ] I have clearly listed my changes in the PR description
- [ ] I have made a test plan
- [ ] I have tested my changes according to the test plan:
<!-- Put your test plan here: -->
- [ ] ...
<details>
<summary>Example test plan</summary>
- [ ] Create from scratch and execute an agent with at least 3 blocks
- [ ] Import an agent from file upload, and confirm it executes
correctly
- [ ] Upload agent to marketplace
- [ ] Import an agent from marketplace and confirm it executes correctly
- [ ] Edit an agent from monitor, and confirm it executes correctly
</details>
#### For configuration changes:
- [ ] `.env.example` is updated or already compatible with my changes
- [ ] `docker-compose.yml` is updated or already compatible with my
changes
- [ ] I have included a list of my configuration changes in the PR
description (under **Changes**)
<details>
<summary>Examples of configuration changes</summary>
- Changing ports
- Adding new services that need to communicate with each other
- Secrets or environment variable changes
- New or infrastructure changes such as databases
</details>
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