[Internal] Added TF Plugin Framework checkbox item to PR template and removed checkbox for integration tests passing (#4227)

## Changes
<!-- Summary of your changes that are easy to understand -->

To facilitate migration to plugin framework :-)

## Tests
<!-- 
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->

- [ ] `make test` run locally
- [ ] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] relevant acceptance tests are passing
- [ ] using Go SDK

Author: alexott

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,5 +9,5 @@ How is this tested? Please see the checklist below and also describe any other r
 - [ ] `make test` run locally
 - [ ] relevant change in `docs/` folder
 - [ ] covered with integration tests in `internal/acceptance`
-- [ ] relevant acceptance tests are passing
 - [ ] using Go SDK
+- [ ] using TF Plugin Framework