add preload libraries in trunktoml

[EvanHStanton]

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[ianstanton]

@EvanHStanton if we want to use preload_libraries here we need to make a CLI change

[ianstanton]

FYI the 'Enable the extension' step won't run on main branch:

trunk/.github/workflows/extensions.yaml

Lines 86 to 87 in ead78c9

	- name: Enable the extension
	if: ${{ github.ref != 'refs/heads/main' }}

This is designed for cases (like this) in which we know enabling the extension will fail due to shared_preload_libraries not set. For this PR, we want to check the following for each extension test:

• Does build succeed?
• Does installation succeed?
  • Does the post installation output instruct the user to set shared_preload_libraries value?
• If enable fails
  • Does it fail because it requires library loaded? If so, we're good