Only remove pr labels if checkbox is explicitly unchecked

[bmos]

What is this change?

• Do not remove labels if checkbox is not present

Considerations for discussion

• As seen in Daisychain connector #1283, the existing workflow was removing labels that were manually added

How to test the changes (if needed)

• It has to be merged, as the label check workflow runs based on the workflow on main

Breaking Changes

Breaking changes are changes to our public API which may require existing users to change their code. If there are no breaking changes, any existing parsons user should not need to do anything after updating their parsons version.

Does this PR introduce breaking changes?

• label: Breaking change — This PR introduces one or more breaking changes.
• label: Non-breaking change — This PR does not introduce one or more breaking changes.

Details (if needed)

• (List out any changes to the API that may cause breaks for developer implementation.)