Remove unnecesary contrib packages from docs install

[NathanielRN]

Description

As a follow up to #1464 I found that the docs tests pass just fine if there these packages are not installed.

Making this PR to mostly ask questions if anyone knows why these were needed!

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

tox -e docs passes and the sphinx build is created without a problem.

Does This PR Require a Contrib Repo Change?

• No.

Checklist:

• Followed the style guidelines of this project
  - [ ] Changelogs have been updated
  - [ ] Unit tests have been added
  - [ ] Documentation has been updated

[lzchen]

Wasn't this the fix for the original docs build failing in the first place?

[NathanielRN]

@lzchen Originally the docs were failing because it couldn’t find a clone of the Contrib repo in its root directory (we made that during the GitHub action workflow but not this one). So the earlier fix downloaded them from Git instead of installing a local version of the package. But turns out all references to Contrib packages are in code examples not documented code.

[lzchen]

@NathanielRN
Did we remove all the code examples that had contrib related stuff in them? Can you link the PR?

[NathanielRN]

@lzchen

We didn't have to remove them, the Contrib examples are still here in Core as referenced in Getting Started and as found in the docs/examples/ folder.

I think we just assumed that we needed to download the instrumentations for these examples, but because these examples aren't getting auto-documented themselves (they're just being pointed to as files), they don't need to be referenced explicitly.

[codeboten]

LGTM