meta: Slim down PR template (#3382)

Moved the maintainer part to the wiki.

---------

Co-authored-by: Daniel Szoke <7881302+szokeasaurusrex@users.noreply.github.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,16 +2,6 @@
 
 ---
 
-## General Notes
+Thank you for contributing to `sentry-python`! Please add tests to validate your changes, and lint your code using `tox -e linters`.
 
-Thank you for contributing to `sentry-python`!
-
-Please add tests to validate your changes, and lint your code using `tox -e linters`.
-
-Running the test suite on your PR might require maintainer approval. Some tests (AWS Lambda) additionally require a maintainer to add a special label to run and will fail if the label is not present.
-
-#### For maintainers
-
-Sensitive test suites require maintainer review to ensure that tests do not compromise our secrets. This review must be repeated after any code revisions.
-
-Before running sensitive test suites, please carefully check the PR. Then, apply the `Trigger: tests using secrets` label. The label will be removed after any code changes to enforce our policy requiring maintainers to review all code revisions before running sensitive tests.
+Running the test suite on your PR might require maintainer approval. The AWS Lambda tests additionally require a maintainer to add a special label, and they will fail until this label is added.